Merge pull request #363 from ftlabs/pr-257

Add Firefox check — replaces PR #257

lib/fastclick.js

@@ -735,6 +735,7 @@
 		var metaViewport;
 		var chromeVersion;
 		var blackberryVersion;
+		var firefoxVersion;
 
 		// Devices that don't support touch don't need FastClick
 		if (typeof window.ontouchstart === 'undefined') {
@@ -792,6 +793,18 @@
 			return true;
 		}
 
+		// Firefox version - zero for other browsers
+		firefoxVersion = +(/Firefox\/([0-9]+)/.exec(navigator.userAgent) || [,0])[1];
+
+		if (firefoxVersion >= 27) {
+			// Firefox 27+ does not have tap delay if the content is not zoomable - https://bugzilla.mozilla.org/show_bug.cgi?id=922896
+
+			metaViewport = document.querySelector('meta[name=viewport]');
+			if (metaViewport && (metaViewport.content.indexOf('user-scalable=no') !== -1 || document.documentElement.scrollWidth <= window.outerWidth)) {
+				return true;
+			}
+		}
+
 		// IE11: prefixed -ms-touch-action is no longer supported and it's recomended to use non-prefixed version
 		// http://msdn.microsoft.com/en-us/library/windows/apps/Hh767313.aspx
 		if (layer.style.touchAction === 'none' || layer.style.touchAction === 'manipulation') {