@@ -782,8 +782,8 @@ AboutReader.prototype = {
782782 } ,
783783
784784 _showError ( ) {
785- this . _headerElement . classList . remove ( "reader-show-element" ) ;
786- this . _contentElement . classList . remove ( "reader-show-element" ) ;
785+ this . _headerElement . style . display = "none" ;
786+ this . _contentElement . style . display = "none" ;
787787
788788 let errorMessage = gStrings . GetStringFromName ( "aboutReader.loadError" ) ;
789789 this . _messageElement . textContent = errorMessage ;
@@ -817,7 +817,7 @@ AboutReader.prototype = {
817817 } ,
818818
819819 _showContent ( article ) {
820- this . _messageElement . classList . remove ( "reader-show-element" ) ;
820+ this . _messageElement . style . display = "none" ;
821821
822822 this . _article = article ;
823823
@@ -830,7 +830,7 @@ AboutReader.prototype = {
830830 this . _readTimeElement . textContent = this . _formatReadTime ( article . readingTimeMinsSlow , article . readingTimeMinsFast ) ;
831831 this . _doc . title = article . title ;
832832
833- this . _headerElement . classList . add ( "reader-show-element" ) ;
833+ this . _headerElement . style . display = "block" ;
834834
835835 let parserUtils = Cc [ "@mozilla.org/parserutils;1" ] . getService ( Ci . nsIParserUtils ) ;
836836 let contentFragment = parserUtils . parseFragment ( article . content ,
@@ -841,7 +841,7 @@ AboutReader.prototype = {
841841 this . _maybeSetTextDirection ( article ) ;
842842 this . _foundLanguage ( article . language ) ;
843843
844- this . _contentElement . classList . add ( "reader-show-element" ) ;
844+ this . _contentElement . style . display = "block" ;
845845 this . _updateImageMargins ( ) ;
846846
847847 this . _requestFavicon ( ) ;
@@ -856,8 +856,8 @@ AboutReader.prototype = {
856856 } ,
857857
858858 _hideContent ( ) {
859- this . _headerElement . classList . remove ( "reader-show-element" ) ;
860- this . _contentElement . classList . remove ( "reader-show-element" ) ;
859+ this . _headerElement . style . display = "none" ;
860+ this . _contentElement . style . display = "none" ;
861861 } ,
862862
863863 _showProgressDelayed ( ) {
@@ -869,11 +869,11 @@ AboutReader.prototype = {
869869 return ;
870870 }
871871
872- this . _headerElement . classList . remove ( "reader-show-element" ) ;
873- this . _contentElement . classList . remove ( "reader-show-element" ) ;
872+ this . _headerElement . style . display = "none" ;
873+ this . _contentElement . style . display = "none" ;
874874
875875 this . _messageElement . textContent = gStrings . GetStringFromName ( "aboutReader.loading2" ) ;
876- this . _messageElement . classList . add ( "reader-show-element" ) ;
876+ this . _messageElement . style . display = "block" ;
877877 } , 300 ) ;
878878 } ,
879879
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