In opening this link in new web browser window,
browser goes to line 275.
source:trunk/public/help/zh-tw/wiki_syntax_detailed.html@13340#L275

IE and Chrome work fine, but Firefox 31.0 does not work.
Firefox stays on top of page.
On click in address bar, ff goes to line 275.

It seems jquery-1.8.3-ui-1.9.2-ujs-2.0.3.js problem.
Following modificaion works.

diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1295,7 +1295,8 @@ module ApplicationHelper

   # Returns the javascript tags that are included in the html layout head
   def javascript_heads
-    tags = javascript_include_tag('jquery-1.8.3-ui-1.9.2-ujs-2.0.3', 'application')
+    # tags = javascript_include_tag('jquery-1.8.3-ui-1.9.2-ujs-2.0.3', 'application')
+    tags = ""
     unless User.current.pref.warn_on_leaving_unsaved == '0'
       tags << "\n".html_safe + javascript_tag("$(window).load(function(){ warnLeavingUnsaved('#{escape_javascript l(:text_warn_on_leaving_unsaved)}'); });")
     end