default.filter

#################################################################################
#
#  File        :  default.filter
#
#  Purpose     :  Rules to process the content of web pages
#
#  Copyright   :  Written by and Copyright (C) 2001-2022 the
#                 Privoxy team. https://www.privoxy.org/
#
#                 This program is free software; you can redistribute it
#                 and/or modify it under the terms of the GNU General
#                 Public License as published by the Free Software
#                 Foundation; either version 2 of the License, or (at
#                 your option) any later version.
#
#                 This program is distributed in the hope that it will
#                 be useful, but WITHOUT ANY WARRANTY; without even the
#                 implied warranty of MERCHANTABILITY or FITNESS FOR A
#                 PARTICULAR PURPOSE.  See the GNU General Public
#                 License for more details.
#
#                 The GNU General Public License should be included with
#                 this file.  If not, you can view it at
#                 http://www.gnu.org/copyleft/gpl.html
#                 or write to the Free Software Foundation, Inc., 59
#                 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
#################################################################################
#
# Syntax:
#
# Generally filters start with a line like "FILTER: name description".
# They are then referrable from the actionsfile with +filter{name}
#
# FILTER marks a filter as content filter, other filter
# types are CLIENT-HEADER-FILTER, CLIENT-HEADER-TAGGER,
# SERVER-HEADER-FILTER and SERVER-HEADER-TAGGER.
#
# Inside the filters, write one Perl-Style substitution (job) per line.
# Jobs that precede the first FILTER: line are ignored.
#
# For Details see the pcrs manpage contained in this distribution.
# (and the perlre, perlop and pcre manpages)
#
# Note that you are free to choose the delimiter as you see fit.
#
# Note2: In addition to the Perl options gimsx, the following nonstandard
# options are supported:
#
# 'U' turns the default to ungreedy matching.  Add ? to quantifiers to
#     switch back to greedy.
#
# 'T' (trivial) prevents parsing for backreferences in the substitute.
#     Use if you want to include text like '$&' in your substitute without
#     quoting.
#
# 'D' (Dynamic) allows the use of variables. Supported variables are:
#     $host, $listen-address, $origin (the IP address the request came
#     from), $path and $url.
#
#     Note that '$' is a bad choice as delimiter for dynamic filters as you
#     might end up with unintended variables if you use a variable name
#     directly after the delimiter. Variables will be resolved without
#     escaping anything, therefore you also have to be careful not to chose
#     delimiters that appear in the replacement text. For example '<' should
#     be save, while '?' will sooner or later cause conflicts with $url.
#
#################################################################################


#################################################################################
#
# js-annoyances: Get rid of particularly annoying JavaScript abuse.
#
#################################################################################
FILTER: js-annoyances Get rid of particularly annoying JavaScript abuse.

# Note: Most of these jobs would be safer if restricted to a
# <script> context as in:
#
# s/(<script.*)nasty-item(?=.*<\/script>)/$1replacement/sigU
#
# but that would make them match only the first occurrence of
# nasty-item in each <script>. We need nestable jobs!

# Get rid of Javascript referrer tracking.
# Test page: http://www.javascript-page.com/referrer.html
#
s|(?:\w+\.)+referrer|false.toString()|gisU

# The status bar is for displaying link targets, not pointless blahblah
#
s@([\W]\s*)((?:this|window)\.(?:default)?status)\s*=\s*((['"]).*?\4)@$1$2 =\
 (typeof(this.href) != 'undefined')?($3 + ' URL: ' + this.href):($2)@ig

s/(?:(?:this|window)\.(?:default)?status)\s*=\s*\w*\s*;//ig

# Kill OnUnload popups. Yummy.
# Test: http://www.zdnet.com/zdsubs/yahoo/tree/yfs.html
#
s/(<body\s+[^>]*)onunload/$1never/siU
s|(<script.*)window\.onunload(?=.*</script>)|$1never|sigU

# If we allow window.open, we want normal window features:
# Test: http://www.htmlgoodies.com/beyond/notitle.html
#
s/(open\s*\([^\)]+resizable=)(["']?)(?:no|0)\2/$1$2yes$2/sigU
s/(open\s*\([^\)]+location=)(["']?)(?:no|0)\2/$1$2yes$2/sigU
s/(open\s*\([^\)]+status=)(["']?)(?:no|0)\2/$1$2yes$2/sigU
s/(open\s*\([^\)]+scroll(?:ing|bars)=)(["']?)(?:no|0)\2/$1$2auto$2/sigU
s/(open\s*\([^\)]+menubar=)(["']?)(?:no|0)\2/$1$2yes$2/sigU
s/(open\s*\([^\)]+toolbar=)(["']?)(?:no|0)\2/$1$2yes$2/sigU
s/(open\s*\([^\)]+directories=)(["']?)(?:no|0)\2/$1$2yes$2/sigU
s/(open\s*\([^\)]+fullscreen=)(["']?)(?:yes|1)\2/$1$2no$2/sigU
s/(open\s*\([^\)]+always(?:raised|lowered)=)(["']?)(?:yes|1)\2/$1$2no$2/sigU
s/(open\s*\([^\)]+z-?lock=)(["']?)(?:yes|1)\2/$1$2no$2/sigU
s/(open\s*\([^\)]+hotkeys=)(["']?)(?:yes|1)\2/$1$2no$2/sigU
s/(open\s*\([^\)]+titlebar=)(["']?)(?:no|0)\2/$1$2yes$2/sigU


#################################################################################
#
# js-events: Kill JavaScript event bindings and timers (Radically destructive! Only for extra nasty sites).
#
#################################################################################
FILTER: js-events Kill JavaScript event bindings and timers (Radically destructive! Only for extra nasty sites).

s/(on|event\.)((mouse(over|out|down|up|move))|(un)?load|contextmenu|selectstart)/never/ig
# Not events, but abused on the same type of sites:
s/(alert|confirm)\s*\(/concat(/ig
s/set(timeout|interval)\(/concat(/ig

#################################################################################
#
# html-annoyances: Get rid of particularly annoying HTML abuse.
#
#################################################################################
FILTER: html-annoyances Get rid of particularly annoying HTML abuse.

# New browser windows (if allowed -- see no-popups filter below) should be
# resizeable and have a location and status bar
#
s/(<a\s+href[^>]+resizable=)(['"]?)(?:no|0)\2/$1$2yes$2/igU
s/(<a\s+href[^>]+location=)(['"]?)(?:no|0)\2/$1$2yes$2/igU
s/(<a\s+href[^>]+status=)(['"]?)(?:no|0)\2/$1$2yes$2/igU
s/(<a\s+href[^>]+scrolling=)(['"]?)(?:no|0)\2/$1$2auto$2/igU
s/(<a\s+href[^>]+menubar=)(['"]?)(?:no|0)\2/$1$2yes$2/igU

# The <BLINK> and <MARQUEE> tags were crimes!
#
s-</?(blink|marquee).*>--sigU


#################################################################################
#
# content-cookies: Kill cookies that come in the HTML or JS content.
#
#################################################################################
FILTER: content-cookies Kill cookies that come in the HTML or JS content.

# JS cookies, except those used by antiadbuster.com to detect us:
#
s|(\w+\.)+cookie(?=[ \t\r\n]*=)(?!='aab)|ZappedCookie|ig

# HTML cookies:
#
s|<meta\s+http-equiv=['"]?set-cookie.*>|<!-- ZappedCookie -->|igU


#################################################################################
#
# refresh-tags: Kill automatic refresh tags if refresh time is larger than 9 seconds.
#
#################################################################################
FILTER: refresh-tags Kill automatic refresh tags if refresh time is larger than 9 seconds.

# Note: Only deactivates refreshes with more than 9 seconds delay to
#       preserve monster-stupid but common redirections via meta tags.
#
s@<meta\s+http-equiv\s*=\s*(['"]?)refresh\1\s+content\s*=\s*(['"]?)\d{2,}\s*(;(?:\s*url\s*=\s*)?([^>\2]*))?\2@<link rev="x-refresh" href="$4"@ig


#################################################################################
#
# unsolicited-popups: Disable unsolicited pop-up windows.
#
#################################################################################
FILTER: unsolicited-popups Disable only unsolicited pop-up windows.

s+([^'"]\s*<head.*>)(?=\s*[^'"])+$1<script>function PrivoxyWindowOpen(){return(null);}</script>+isU
s@([^\w\s.]\s*)((?:map)?(window|this|parent)\.?)?open\s*\(@$1PrivoxyWindowOpen(@ig
s+([^'"]\s*</html>)(?!\s*(\\n|'|"))+$1<script>function PrivoxyWindowOpen(a, b, c){return(window.open(a, b, c));}</script>+iU


##################################################################################
#
# all-popups: Kill all popups in JavaScript and HTML.
#
#################################################################################
FILTER: all-popups Kill all popups in JavaScript and HTML.

s@((\W\s*)(?:map)?(window|this|parent)\.?)open\s*\\?\(@$1concat(@ig  # JavaScript
#s/\starget\s*=\s*(['"]?)_?(blank|new)\1?/ notarget/ig        # HTML
s/\starget\s*=\s*(['"]?)_?(blank|new)\1?/ /ig        # (X)HTML

##################################################################################
#
# img-reorder: Reorder attributes in <img> tags to make the banners-by-* filters more effective.
#
#################################################################################
FILTER: img-reorder Reorder attributes in <img> tags to make the banners-by-* filters more effective.

# In the first step src is moved to the start, then width is moved to the second
# place to guarantee an order of src, width, height. Also does some white-space
# normalization.
#
# This makes banners-by-size more effective and allows both banners-by-size
# and banners-by-link to preserve the original image URL in the title attribute.

s|<img\s+?([^>]*)\ssrc\s*=\s*(['"])([^>'" ]+)\2|<img src=$2$3$2 $1|siUg
s|<img\s+?([^>]*)\ssrc\s*=\s*([^'">\\\s]+)|<img src=$2 $1|sig
s|(<img[^>]+height)\s*=\s*|$1=|siUg

s|<img (src=(?:(['"])[^>'" ]*\2\|[^'">\\\s]+?))([^>]*)\s+width\s*=\s*((["']?)\d+?\5)(?=[\s>])|<img $1 width=$4$3|siUg


#################################################################################
#
# banners-by-size: Kill banners by size.
#
#################################################################################
#
# Standard banner sizes taken from http://www.iab.net/iab_banner_standards/bannersizes.html
#
# Note: Use http://config.privoxy.org/send-banner?type=trans for a transparent 1x1 image
#       Use http://config.privoxy.org/send-banner?type=pattern for a grey/white pattern image
#       Use http://config.privoxy.org/send-banner?type=auto  to auto-select.
#
# Note2: Use img-reorder before this filter to ensure maximum matching success
#
#################################################################################
FILTER: banners-by-size Kill banners by size.

# 88*31
s@<img\s+(?:src\s*=\s*(['"]?)([^>\\\1\s]+)\1)?[^>]*?(width=(['"]?)88\4)[^>]*?(height=(['"]?)31\6)[^>]*?(?=/?>)@\
  <img src="http://config.privoxy.org/send-banner?type=auto" border="0" title="Killed-$2-by-size" $3 $5@sig
# 120*60, 120*90, 120*240, 120*600
s@<img\s+(?:src\s*=\s*(['"]?)([^>\\\1\s]+)\1)?[^>]*?(width=(['"]?)120\4)[^>]*?(height=(['"]?)(?:600?|90|240)\6)[^>]*?(?=/?>)@\
  <img src="http://config.privoxy.org/send-banner?type=auto" border="0" title="Killed-$2-by-size" $3 $5@sig
# 125*125
s@<img\s+(?:src\s*=\s*(['"]?)([^>\\\1\s]+)\1)?[^>]*?(width=(['"]?)125\4)[^>]*?(height=(['"]?)125\6)[^>]*?(?=/?>)@\
  <img src="http://config.privoxy.org/send-banner?type=auto" border="0" title="Killed-$2-by-size" $3 $5@sig
# 160*600
s@<img\s+(?:src\s*=\s*(['"]?)([^>\\\1\s]+)\1)?[^>]*?(width=(['"]?)160\4)[^>]*?(height=(['"]?)600\6)[^>]*?(?=/?>)@\
  <img src="http://config.privoxy.org/send-banner?type=auto" border="0" title="Killed-$2-by-size" $3 $5@sig
# 180*150
s@<img\s+(?:src\s*=\s*(['"]?)([^>\\\1\s]+)\1)?[^>]*?(width=(['"]?)180\4)[^>]*?(height=(['"]?)150\6)[^>]*?(?=/?>)@\
  <img src="http://config.privoxy.org/send-banner?type=auto" border="0" title="Killed-$2-by-size" $3 $5@sig
# 234*60, 468*60 (Most Banners!)
s@<img\s+(?:src\s*=\s*(['"]?)([^>\\\1\s]+)\1)?[^>]*?(width=(['"]?)(?:234|468)\4)[^>]*?(height=(['"]?)60\6)[^>]*?(?=/?>)@\
  <img src="http://config.privoxy.org/send-banner?type=auto" border="0" title="Killed-$2-by-size" $3 $5@sig
# 240*400
s@<img\s+(?:src\s*=\s*(['"]?)([^>\\\1\s]+)\1)?[^>]*?(width=(['"]?)240\4)[^>]*?(height=(['"]?)400\6)[^>]*?(?=/?>)@\
  <img src="http://config.privoxy.org/send-banner?type=auto" border="0" title="Killed-$2-by-size" $3 $5@sig
# 250*250, 300*250
s@<img\s+(?:src\s*=\s*(['"]?)([^>\\\1\s]+)\1)?[^>]*?(width=(['"]?)(?:250|300)\4)[^>]*?(height=(['"]?)250\6)[^>]*?(?=/?>)@\
  <img src="http://config.privoxy.org/send-banner?type=auto" border="0" title="Killed-$2-by-size" $3 $5@sig
# 336*280
s@<img\s+(?:src\s*=\s*(['"]?)([^>\\\1\s]+)\1)?[^>]*?(width=(['"]?)336\4)[^>]*?(height=(['"]?)280\6)[^>]*?(?=/?>)@\
  <img src="http://config.privoxy.org/send-banner?type=auto" border="0" title="Killed-$2-by-size" $3 $5@sig

# Note: 200*50 was also proposed, but it probably causes too much collateral damage:
#
#s@<img\s+(?:src\s*=\s*(['"]?)([^>\\\1\s]+)\1)?[^>]*?(width=(['"]?)200\4)[^>]*?(height=(['"]?)50\6)[^>]*?(?=/?>)@\
#   <img src="http://config.privoxy.org/send-banner?type=auto" border="0" title="Killed-$2-by-size" $3 $5@sig


#################################################################################
#
# banners-by-link: Kill banners by their links to known clicktrackers (Experimental).
#
#################################################################################
FILTER: banners-by-link Kill banners by their links to known clicktrackers.

# Common case with width and height attributes:
#
s@<a\s+href\s*=\s*(['"]?)([^>\1\s]*?(?:\
  adclick                             # See www.dn.se \
| advert                              # see dict.leo.org \
| atwola\.com/(?:link|redir)          # see www.cnn.com \
| doubleclick\.net/jump/              # redirs for doublecklick.net ads \
| counter                             # common \
| (?<!&type=)tracker                  # (&type=tracker is used in sf's project statistics) \
| adlog\.pl                           # see sf.net \
)[^>\1\s]*)\1[^>]*>\s*<img\s+(?:src\s*=\s*(['"]?)([^>\\\3\s]+)\3)?[^>]*((?:width|height)\s*=\s*(['"]?)\d+?\6)[^>]*((?:width|height)\s*=\s*(['"]?)\d+?\8)[^>]*?(?=/?>)\
@<img $5 $7 src="http://config.privoxy.org/send-banner?type=auto" border="0" title="Killed $4 by link to $2"@sigx

# Rare case w/o explicit dimensions:
#
s@<a\s+href\s*=\s*(['"]?)([^>\1\s]*?(?:ad(?:click|vert)|atwola\.com/(?:link|redir)|doubleclick\.net/jump/|(?<!&type=)tracker|counter|adlog\.pl)[^>\1\s]*)\1[^>]*>\s*<img\s+(?:src\s*=\s*(['"]?)([^>\\\3\s]+)\3)?[^>]*?(?=/?>)@<img src="http://config.privoxy.org/send-banner?type=auto" border="0" title="Killed $4 by link to $2"@sig


################################################################################
#
# webbugs: Squish WebBugs (1x1 invisible GIFs used for user tracking).
#
#################################################################################
FILTER: webbugs Squish WebBugs (1x1 invisible GIFs used for user tracking).

s@<img[^>]*\s(?:width|height)\s*=\s*['"]?[01](?=\D)[^>]*\s(?:width|height)\s*=\s*['"]?[01](?=\D)[^>]*?>@@siUg


#################################################################################
#
# tiny-textforms: Extend those tiny textareas up to 40x80 and kill the hard wrap.
#
#################################################################################
FILTER: tiny-textforms Extend those tiny textareas up to 40x80 and kill the hard wrap.

s/(<textarea[^>]*?)(?:\s*(?:rows|cols)=(['"]?)\d+\2)+/$1 rows=$2\40$2 cols=$2\80$2/ig
s/(<textarea[^>]*?)wrap=(['"]?)hard\2/$1/ig


#################################################################################
#
# jumping-windows: Prevent windows from resizing and moving themselves.
#
#################################################################################
FILTER: jumping-windows Prevent windows from resizing and moving themselves.

s/(?<=[\W])(?:window|this|self)\.(?:move|resize)(?:to|by)\(/''.concat(/ig

#################################################################################
#
# frameset-borders: Give frames a border, make them resizable and scrollable.
#
#################################################################################
FILTER: frameset-borders Give frames a border and make them resizable.

s/(<frameset\s+[^>]*)framespacing=(['"]?)(no|0)\2/$1/igU
s/(<frameset\s+[^>]*)frameborder=(['"]?)(no|0)\2/$1/igU
s/(<frameset\s+[^>]*)border=(['"]?)(no|0)\2/$1/igU
s/(<frame\s+[^>]*)noresize/$1/igU
s/(<frame\s+[^>]*)frameborder=(['"]?)(no|0)\2/$1/igU
s/(<frame\s+[^>]*)scrolling=(['"]?)(no|0)\2/$1/igU


#################################################################################
#
# iframes: Remove all detected iframes. Should only be enabled for
#          individual sites after testing that the iframes are optional.
#
#################################################################################
FILTER: iframes Removes all detected iframes. Should only be enabled for individual sites.
s@<iframe.*</iframe>@<!-- iframe removed by Privoxy's iframe filter -->@Uisg


#################################################################################
#
# demoronizer: Correct Microsoft's abuse of standardized character sets, which
#              leave the browser to (mis)-interpret unknown characters, with
#              sometimes bizarre results on non-MS platforms.
#
# credit: ripped from the demoroniser.pl script by:
#         John Walker -- January 1998, http://www.fourmilab.ch/webtools/demoroniser
#
#################################################################################
FILTER: demoronizer Fix MS's non-standard use of standard charsets.

s/(&\#[0-2]\d\d)\s/$1; /g
# per Robert Lynch: http://slate.msn.com//?id=2067547, just a guess.
# Must come before x94 below.
s/\xE2\x80\x94/ -- /g
s/\x82/,/g
#s-\x83-<em>f</em>-g
s/\x84/,,/g
s/\x85/.../g
#s/\x88/^/g
#s-\x89- °/°°-g
s/\x8B/</g
s/\x8C/Oe/g
s/\x91/`/g
s/\x92/'/g
s/(\x93|\x94)/"/g
# Bullet type character.
s/\x95/&middot;/g
s/\x96/-/g
s/\x97/--/g
#s-\x98-<sup>~</sup>-g
#s-\x99-<sup>TM</sup>-g
# per Robert Lynch.
s/\x9B/>/g                  # 155


#################################################################################
#
# shockwave-flash: Kill embedded Shockwave Flash objects.
#                  Note: Better just block "/.*\.swf$"!
#
#################################################################################
FILTER: shockwave-flash Kill embedded Shockwave Flash objects.

s|<object [^>]*macromedia.*</object>|<!-- Squished Shockwave Object -->|sigU
s|<embed [^>]*(application/x-shockwave-flash\|\.swf).*>(.*</embed>)?|<!-- Squished Shockwave Flash Embed -->|sigU


#################################################################################
#
# quicktime-kioskmode: Make Quicktime movies saveable.
#
#################################################################################
FILTER: quicktime-kioskmode Make Quicktime movies saveable.

s/(<embed\s+[^>]*)kioskmode\s*=\s*(["']?)true\2/$1/ig


#################################################################################
#
# fun: Text replacements for subversive browsing fun!
#
#################################################################################
FILTER: fun Text replacements for subversive browsing fun!

# SCNR
#
s/microsoft(?!\.[^\s])/MicroSuck/ig

# Buzzword Bingo (example for extended regex syntax)
#
s* (?:industry|world)[ -]leading \
|  cutting[ -]edge \
|  customer[ -]focused \
|  market[ -]driven \
|  award[ -]winning # Comments are OK, too! \
|  high[ -]performance \
|  solutions[ -]based \
|  unmatched \
|  unparalleled \
|  unrivalled \
*$0<sup><font color="red"><b>Bingo!</b></font></sup> \
*igx

# For Germans only
#
s/(M|m)edien(?![^<]*>)/$1&auml;dchen/Ug

#################################################################################
#
# crude-parental: Crude parental filtering. Use with a suitable blocklist.
#                 Pages are "blocked" based on keyword matching.
#
#################################################################################
FILTER: crude-parental Crude parental filtering. Note that this filter doesn't work reliably.

# (Note: Middlesex, Sussex and Essex are counties in the UK, not rude words)
# (Note #2: Is 'sex' a rude word?!)

s%^.*(?<!middle)(?<!sus)(?<!es)sex.*$%<html><head><title>Blocked</title></head><body>\
<h3>Blocked by <a href="http://p.p/">Privoxy's</a> crude-parental filter due to possible adult content.</h3></body></html>\n%is

s+^.*warez.*$+<html><head><title>No Warez</title></head><body><h3>You're not searching for illegal stuff, are you?</h3></body></html>\n+is

# Remove by description
s@^.*\
(?:(suck|lick|tongue|rub|fuck|fingering|finger|chicks?)\s*)?\
(?:(her|your|my|hard|with|big|wet|tight|pink|hot|moist|young|teen)\s*)+\
(dicks?|penis|cocks?|balls?|tits?|pussy|cunt|clit|ass|mouth).*$\
@This page has been blocked by <a href="http://p.p/">Privoxy's</a> crude-parental \
content filter based on the description.\n\
@is

#Remove by link text
s@^.*\
(download|broadband|view|watch|free|get|extreem)?\s*\
(sex|xxx|porn|cumshot|fuck(ing|s)?|anal|ass|asian|adult|Amateur|org(y|ies)|close ups?|hand?job|nail(ed)?)+\s*\
(movies?|pics?|videos?|dvds?|dvd's|links?).*$\
@This page has been blocked by <a href="http://p.p/">Privoxy's</a> crude-parental \
content filter based on link text.\n\
@is

#Remove by age disclaimer
s@^.*\
(models?|chicks?|girls?|women|persons)\s*\
(who|are|were)+ (over|at least) (16|18|21) years (old|of age).*$\
@This page has been blocked by <a href="http://p.p/">Privoxy's</a> crude-parental \
content filter because of an age disclaimer.\n\
@is

#Remove by regulations
s@^.*(Section 2257|18 U.?S.?C.? 2257).*$\
@This page has been blocked by <a href="http://p.p/">Privoxy's</a> crude-parental \
content filter because of an regulations text.\n\
@is


#################################################################################
#
# IE-Exploits: Disable some known Internet Explorer bug exploits.
#
#################################################################################
FILTER: ie-exploits Disable some known Internet Explorer bug exploits.

# Note: This is basically a demo and waits for someone more interested in IE
# security (sic!) to take over.

# Cross-site-scripting:
#
s%f\("javascript:location.replace\('mk:@MSITStore:C:'\)"\);%alert\("This page looks like it tries to use a vulnerability described here:\n http://online.securityfocus.com/archive/1/298748/2002-11-02/2002-11-08/2"\);%siU

# Address bar spoofing (http://www.secunia.com/advisories/10395/):
#
s/(<a[^>]*href[^>]*)(?:\x01|\x02|\x03|%0[012])@/$1MALICIOUS-LINK@/ig

# Nimda:
#
s%<script language="JavaScript">(window\.open|1;''\.concat)\("readme\.eml", null, "resizable=no,top=6000,left=6000"\)</script>%<br><font size="7"> WARNING: This Server is infected with <a href="http://www.cert.org/advisories/CA-2001-26.html">Nimda</a>!</font>%g


#################################################################################
#
#
# site-specifics: Cure for site-specific problems. Don't apply generally!
#
#   Note: The fixes contained here are so specific to the problems of the
#         particular web sites they are designed for that they would be a
#         waste of CPU cycles (or even destructive!) on 99.9% of the web
#         sites where they don't apply.
#
#################################################################################
FILTER: site-specifics Cure for site-specific problems. Don't apply generally!

# www.spiegel.de excludes X11 users from viewing Flash5 objects - shame.
# Apply to: www.spiegel.de/static/js/flash-plugin.js
#
s/indexOf\("x11"\)/indexOf("x13")/

# www.quelle-bausparkasse.de uses a very stupid redirect mechanism that
# relies on a webbug being present. Can we tolerate that? No!
# Apply to: www.quelle-bausparkasse.de/$
#
s/mylogfunc()//g

# groups.yahoo.com has splash pages that one needs to click through in
# order to access the actual messages. Let the browser do that. Thanks
# to Paul Jobson for this one:
#
s|<a href="(.+?)">(?:Continue to message\|Weiter zu Nachricht)</a>|<meta http-equiv="refresh" content="0; URL=$1">|ig

# monster.com has two very similar gimmicks:
#
s|<input type="hidden" name="REDIRECT" value="(.+?)">|<meta http-equiv="refresh" content="0; URL=$1">|i

s|<IMG SRC="http://media.monster.com/mm/usen/my/no_thanks_211x40.gif".+?>|<meta http-equiv="refresh" content="0; URL=http://my.monster.com/resume.asp">|i

# nytimes.com triggers popups through the onload handler of dummy images
# to fool popup-blockers.
#
s|(<img [^>]*)onload|$1never|sig

# Pre-check all the "Discard" buttons in GNU Mailman's web interface.
# (This saves a lot of mouse aiming practice when flushing spamtraps)
#
s|(<INPUT name="\d{2,4}" type="RADIO" value="0") CHECKED |$1|g
s|<INPUT name="\d{2,4}" type="RADIO" value="3" |$0 checked|g

#################################################################################
#
# no-ping: Removes non-standard ping attributes in <a> and <area> tags.
#
#################################################################################
FILTER: no-ping Removes non-standard ping attributes in <a> and <area> tags.
s@(<a(?:rea)?[^>]*?)\sping=(['"]?)([^"'>]+)\2([>\s]?)@\
<strong style="color:white; background-color:red;" title="Privoxy removed ping target '$3'">PING!</strong>\n$1$4@ig

#################################################################################
#
# allow-autocompletion: Changes autocomplete="off" on form and input fields
#                       to "on" to allow autocompletion.
#
#################################################################################
FILTER: allow-autocompletion Changes autocomplete="off" on form and input fields to "on" to allow autocompletion.

s@(<(?:input|form|select|textarea)\s[^>]+autocomplete=)(['"]?)(?:off|0)\2@$1$2on$2@igsU

#################################################################################
#
# github: Removes the annoying "Sign-Up" banner and the Cookie disclaimer.
#
#################################################################################
FILTER: github Removes the annoying "Sign-Up" banner and the Cookie disclaimer.

s@<signup-prompt.*</signup-prompt>@@Uis
s@(<div) (class="hx_cookie-banner)@$1 style="display:none;" $2@

#################################################################################
#
# imdb: Removes some ads on IMDb.
#
#################################################################################
FILTER: imdb Removes some ads on IMDb.

s@(<div id="top_ad_wrapper")@$1 style="display:none"@
s@<iframe[^>]*id="top_ad"[^>]*>.*</iframe>@<!-- Iframe removed by Privoxy's imdb filter -->@
s@<iframe[^>]*onload="doWithAds.call[^>]*></iframe>@<!-- Iframe removed by Privoxy's imdb filter -->@g

#################################################################################
#
# google: CSS-based block for Google text ads. Also removes
#         a width limitation and the toolbar advertisement.
#
#################################################################################
FILTER: google CSS-based block for Google text ads. Also removes a width limitation and the toolbar advertisement.

s@</head>[^\\]@<style type="text/css">\n\
 /* Style sheet inserted by Privoxy's google filter. */\n\
 \#fbc, \#fbl, \#ra, .rhh {visibility: hidden !important;}\n\
 \#tpa1,\#tpa2,\#tpa3,\#tpa4,\#tpa5,\#tpa5, \#spl, .ch, \#ads,\
 \#toolbar, \#google_ads_frame, \#mbEnd {display: none !important;}\n\
 .main_body, .j, \#res, .med, .hd, .g, .s\n\
 {width: 99%; max-width: 100%; margin-left: 0; margin-right: 0;}\n\
 </style>\n$0@
s@<div style=\"padding-top:11px;min-width:500px\">@<div id="main_body">@
s@(<table cellspacing=0 cellpadding=0 width=25% align=right bgcolor=\#ffffff border=0\
|</font></td></tr></tbody></table><table align=\"right\" bgcolor=\"\#ffffff\"\
|<table cellspacing=0 cellpadding=0 align=right bgcolor=\#ffffff border=0\
|<table style=\"clear:both\" align=right width=25% cellspacing=\"0\" cellpadding=\"0\"\
 border=\"0\" bgcolor=\"\#ffffff\")@$0 id="ads"@
s@(<br clear=all><table)( border=0 cellpadding=9><tr><td)@$1 id="toolbar"$2@

#################################################################################
#
# yahoo: CSS-based block for Yahoo text ads. Also removes a width limitation.
#
#################################################################################
FILTER: yahoo CSS-based block for Yahoo text ads. Also removes a width limitation.

s@</head>@\n<style type="text/css">\n\
 /* Style sheet inserted by Privoxy's yahoo filter. */\n\
 \#symadbn, \#ymadbn, .yschbox, .yschhd, .bbox, \#yschsec, \#sec,\
 \#yschanswr, .yschftad, .yschspn, .yschspns, \#ygrp-sponsored-links,\
 \#nwad, \#MWA2, \#MSCM, \#yregad, \#sponsored-links,\
 \#ks-ypn-ads, .ad, \#east, \#ygrp-vital, .ads {display: none !important;}\n\
 \#yschpri, \#yschweb, \#pri, \#web, \#main, .yschttl, .abstr, .res \n\
 {width: 99% !important; max-width: 100% !important;}\n\
 .yschttl, .res, .res.indent, \#web {padding: 0px; margin: 0px !important;}\n\
 \#web {padding-left: 0.5em}\n\
 \#yschqcon, \#yschtg {width: auto !important; /* No useless horizontal scrollbar please */}\n\
 \#composebox \#compose_editorArea {width: 70% !important; /* reasonably sized reply textarea please */\n\
 </style>\n$0\n@

s@(<textarea\s+id="composeArea"[^>]*)width:545px;@$1width:70%;@isU

#################################################################################
#
# msn: CSS-based block for MSN text ads. Also removes tracking URLs
#      and a width limitation.
#
#################################################################################
FILTER: msn CSS-based block for MSN text ads. Also removes tracking URLs and a width limitation.

s@</head>@<style type="text/css">\n\
 /* Style sheet inserted by Privoxy's msn filter. */\n\
 .msn_ads, \#at, \#ar, .mktmsg {display: none !important;}\n\
 \#results, \#b_results, .flank, .results_area_flank, .results_area_stroke,\n\
 \#results_area, \#content, .sb_tlst, .sa_cc, .sb_ph, \#sw_main,\n\
 .content, .b_content, \#sw_foot, \#bf, \#sw_content, \#sidebar, \#pag\n\
 {width: 99% !important; min-width: 99% !important;\n\
 max-width: 100% !important; /* width:100% sometimes causes horizontal scrollbars */}\n\
 /* Remove 'related' ads */\n\
 .b_ad, .b_adlabel {clear: both; display:none;}\n\
 /* Remove "suggestions". They are next to worthless but partly overlap with the search results */\n\
 .suggestion, \#nys_right, \#nys {clear: both; display:none;}\n\
 /* Remove "Related searches" at the left side of the main results.\n\
    They are next to worthless, too, and also are still present below the main search results */\n\
 \#b_results > .b_ans {clear: both; display:none;}\n\
 \#s_notf_div,\n \
 /* Overlay ads to enable Facebook 'likes' in search results. */\n\
 .sn_container {display:none !important;}\n\
 \#content, \#b_content {padding: 0px 0px 0px 0px}\n\
 </style>\n$0@
# Are these ids still in use?
s@(<div[^>]*) id=(["']?)ads_[^\2]*\2@$1 class="msn_ads"@Uig
s@(<div[^>]*) class=(["']?)sb_ads[^\2]*\2@$1 class="msn_ads"@Uig
s@(<a[^>]*href=\")http://g.msn.com/.*\?(http://.*)(&amp;&amp;DI=.*)(\")@$1$2$4@Ug
s@(<a[^>]*)gping=\".*\"@$1 title="URL cleaned up by Privoxy's msn filter"@Ug

#################################################################################
#
# blogspot: Cleans up some Blogspot blogs. Read the fine print before using this.
#
#           This filter also intentionally removes some navigation stuff and
#           sets the page width to 100%. As a result, some rounded "corners" would
#           appear to early or not at all and as fixing this would require a browser
#           that understands background-size (CSS3), they are removed instead.
#
#           When applied to feeds, it removes comment titles that
#           only contain the beginning of the actual comment.
#
#################################################################################
FILTER: blogspot Cleans up some Blogspot blogs. Read the fine print before using this.

s@</head>@<style type="text/css">\n\
 /* Style sheet inserted by Privoxy's blogspot filter. */\n\
 \#powered-by {display: none !important;}\n\
 \#wrap4, \#wrapper {margin-top: 0px }\n\
 \#blogheader, \#header {margin-top: 0.5em !important}\n\
 \#content {width: 98% }\n\
 \#main {width: 70% }\n\
 \#sidebar {width: 29% }\n\
 .post-body {overflow: auto;}\n\
 .blogComments {width: 100%; overflow: auto;}\n</style>\n$0@
s@<body.*(?:<div id="space-for-ie"></div>|(<div id="(?:content|wrap4|wrapper)))@<body>\
 <!-- Privoxy's blogspot filter ditched some garbage here -->$1@Us
s@(<div style=\"[^\"]*width:)30em@$1 100%@
s@background:url\(\"http://www.blogblog.com/rounders[^\"]*\"\).*;@/*$0*/@Ug
s@(background:\#[a-f\d]{3})( url\(\"http://www.blogblog.com/rounders[^\"]*\"\).*;)@$1 ;/*$2*/@Ug
# Do the feed filtering magic as described above.
s@<title(?:\s+type=\'text\')?>([^<]*)(?:\.\.\.)?\s*</title>\s*\
(<content(?:\s+type=\'(?:html|text)\')?>\s*\1)@<title></title>$2@ig


#################################################################################
#
# bundeswehr.de: Hide the cookie and privacy info banner on bundeswehr.de.
#
#                The relevant parts of the page work without accepting cookies.
#
#################################################################################
FILTER: bundeswehr.de Hide the cookie and privacy info banner on bundeswehr.de
s@<div class="privacy-protection-banner__container"@$0 style="display: none"@

#################################################################################
#
# sourceforge: Reduces the amount of ads for proprietary software on SourceForge.
#
#################################################################################
FILTER: sourceforge Reduces the amount of ads for proprietary software on SourceForge.

s@<div id="banner-sterling"@$0 style="display:none;"@
s@<section id="nels"@$0 style="display:none;"@
s@<aside class="m-wide-widget m-wide-projects-widget "@$0 style="display:none;"@
s@<div id="newsletter-floating"@$0 style="display:none;"@
s@<div class="sterling" id="banner-sterling"@$0 style="display:none;"@

#################################################################################
#
# x-httpd-php-to-html: Changes the Content-Type header from
#                      x-httpd-php to html. "Content-Type: x-httpd-php"
#                      is set by clueless PHP users and causes many
#                      browsers do open a download menu instead of
#                      rendering the page.
#
#################################################################################
SERVER-HEADER-FILTER: x-httpd-php-to-html Changes the Content-Type header from x-httpd-php to html.

s@^(Content-Type:)\s*application/x-httpd-php@$1 text/html@i

#################################################################################
#
# html-to-xml: Changes the Content-Type header from html to xml.
#
#################################################################################
SERVER-HEADER-FILTER: html-to-xml Changes the Content-Type header from html to xml.

s@^(Content-Type:)\s*text/html(;.*)?$@$1 application/xhtml+xml$2@i

#################################################################################
#
# xml-to-html: Changes the Content-Type header from xml to html.
#
#################################################################################
SERVER-HEADER-FILTER: xml-to-html Changes the Content-Type header from xml to html.

s@^(Content-Type:)\s*(?:application|text)/(?:xhtml\+)?xml(;.*)?$@$1 text/html$2@i

#################################################################################
#
# hide-tor-exit-notation: Remove the Tor exit node notation in Host and Referer headers.
#
#   Note: If Privoxy and Tor are chained and Privoxy is configured to
#         use socks4a, one can use http://www.example.org.foobar.exit/
#         to access the host www.example.org through Tor exit node foobar.
#
#         As the HTTP client isn't aware of this notation, it treats the
#         whole string "www.example.org.foobar.exit" as host and uses it
#         for the "Host" and "Referer" headers. From the server's point of
#         view the resulting headers are invalid and can cause problems.
#
#         An invalid "Referer" header can trigger "hot-linking" protections,
#         an invalid "Host" header will make it impossible for the server to
#         find the right vhost (several domains hosted on the same IP address).
#
#         This filter removes the "foo.exit" part in those headers
#         to prevent the mentioned problems. Note that it only modifies
#         the HTTP headers, it doesn't make it impossible for the server
#         to detect your Tor exit node based on the IP address the request is
#         coming from.
#
#################################################################################
CLIENT-HEADER-FILTER: hide-tor-exit-notation Removes the Tor exit node notation in Host and Referer headers.

s@^((?:Referer|Host):\s*(?:https?://)?[^/]*)\.[^\./]*?\.exit@$1@i

#################################################################################
#
# no-brotli-accepted: Strips "br" from the Accept-Encoding header as Privoxy
#                     currently doesn't support Brotli.
#
#################################################################################
CLIENT-HEADER-FILTER: no-brotli-accepted Strip "br" from Accept-Encoding header

s@(^Accept-Encoding:.*?)(?:br, |, br|br)@$1@i

#################################################################################
#
# less-download-windows: Prevents annoying download windows for content types
#                        the browser can handle itself.
#
#################################################################################
SERVER-HEADER-FILTER: less-download-windows Prevent annoying download windows for content types the browser can handle itself.

s@^Content-Disposition:.*filename=(["']?).*\.(png|gif|jpe?g|diff?|d?patch|c|h|pl|shar)\1.*$@@i
s@^(Content-Type:)\s*(?:message/(?:news|rfc822)|text/x-.*|application/x-sh(?:\s|$))\s*@$1 text/plain@i

#################################################################################
#
# image-requests: Tags detected image requests as "IMAGE-REQUEST". Whether
#                 or not the detection actually works depends on the browser.
#
#################################################################################
CLIENT-HEADER-TAGGER: image-requests Tags detected image requests as "IMAGE-REQUEST".

s@^Accept:\s*image/.*@IMAGE-REQUEST@i

#################################################################################
#
# css-requests:  Tags detected CSS requests as "CSS-REQUEST". Whether
#                or not the detection actually works depends on the browser.
#
#################################################################################
CLIENT-HEADER-TAGGER: css-requests Tags detected CSS requests as "CSS-REQUEST".

s@^Accept:\s*text/css.*@CSS-REQUEST@i

#################################################################################
#
# range-requests: Tags range requests as "RANGE-REQUEST".
#
#                 By default Privoxy removes Range headers for requests to
#                 ressources that will be filtered to make sure the filters
#                 get the whole picture. Otherwise Range requests could be
#                 intentionally used to circumvent filters or, less likely,
#                 filtering a partial response may damage it because it matched
#                 a pattern that the ressource as a whole wouldn't.
#
#                 Range requests can be useful and save bandwidth so instead
#                 of removing Range headers for requests to ressources that
#                 will be filtered, you may prefer to simply disable filtering
#                 for those requests.
#
#                 That's what this tagger is all about. After enabling it,
#                 you can disable filtering for range requests using the following
#                 action section:
#
#                 {-filter -deanimate-gifs}
#                 TAG:^RANGE-REQUEST
#
#################################################################################
CLIENT-HEADER-TAGGER: range-requests Tags range requests as "RANGE-REQUEST".

s@^Range:.*@RANGE-REQUEST@i

#################################################################################
#
# client-ip-address: Tags the request with the client's IP address.
#
#################################################################################
CLIENT-HEADER-TAGGER: client-ip-address Tags the request with the client's IP address.

s@^\w*\s+.*\s+HTTP/\d\.\d\s*@IP-ADDRESS: $origin@D

#################################################################################
#
# listen-address: Tags the request with the listen-address on which the request
#                 came in.
#
#################################################################################
CLIENT-HEADER-TAGGER: listen-address Tags the request with the listen-address on which the request came in.

s@^\w*\s+.*\s+HTTP/\d\.\d\s*@LISTEN-ADDRESS: $listen-address@D

#################################################################################
#
# http-method: Tags the request with its HTTP method.
#
#################################################################################
CLIENT-HEADER-TAGGER: http-method Tags the request with its HTTP method.

s@^(\w*).*HTTP/\d\.\d\s*$@$1@i

#################################################################################
#
# allow-post: Tags POST requests as "ALLOWED-POST".
#
#################################################################################
CLIENT-HEADER-TAGGER: allow-post Tags POST requests as "ALLOWED-POST".

s@^(?:POST)\s+.*\s+HTTP/\d\.\d\s*@ALLOWED-POST@i

#################################################################################
#
# complete-url: Tags the request with the whole request URL.
#
#################################################################################
CLIENT-HEADER-TAGGER: complete-url Tags the request with the whole request URL.

s@^\w*\s+(.*)\s+HTTP/\d\.\d\s*$@$1@i

#################################################################################
#
# user-agent: Tags the request with the complete User-Agent header.
#
#################################################################################
CLIENT-HEADER-TAGGER: user-agent Tags the request with the complete User-Agent header.

s@^User-Agent:.*@$0@i

#################################################################################
#
# referer: Tags the request with the complete Referer header.
#
#################################################################################
CLIENT-HEADER-TAGGER: referer Tags the request with the complete Referer header.

s@^Referer:.*@$0@i

#################################################################################
#
# content-type: Tags the request with the content type declared by the server.
#
#################################################################################
SERVER-HEADER-TAGGER: content-type Tags the request with the content type declared by the server.

s@^Content-Type:\s*([^;]+).*@$1@i

#################################################################################
#
# privoxy-control: The taggers create tags with the content of X-Privoxy-Control
#                  headers, the filters remove said headers.
#
#################################################################################
CLIENT-HEADER-TAGGER: privoxy-control Creates tags with the content of X-Privoxy-Control headers.

s@^X-Privoxy-Control:\s*@@i

CLIENT-HEADER-FILTER: privoxy-control Removes X-Privoxy-Control headers.

s@^X-Privoxy-Control:.*@@i

SERVER-HEADER-TAGGER: privoxy-control Creates tags with the content of X-Privoxy-Control headers.

s@^X-Privoxy-Control:\s*@@i

SERVER-HEADER-FILTER: privoxy-control Removes X-Privoxy-Control headers.

s@^X-Privoxy-Control:.*@@i

#################################################################################
#
# client-body: Modify client request body
#
#################################################################################
CLIENT-BODY-FILTER: remove-first-byte Removes the first byte from the request body
s@^.@@

CLIENT-BODY-FILTER: remove-test Removes "test" everywhere in the request body
s@test@@g

CLIENT-BODY-FILTER: overwrite-test-value Overwrites the value of the "test" variable with blafasel
s@(test=)[^&\s]*@$1blafasel@g