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FFExt: Modify any page on pageload (including background tabs)

/ Published in: JavaScript
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Copy this code and paste it in your HTML 
  1. function set_pageload(browser){browser.addEventListener("DOMContentLoaded", pageload, false)}
  2. function add_tab(e){set_pageload(e.target.linkedBrowser)}
  3. function pageload(){
  4.     var doc = this.contentWindow.document
  5.  
  6.     // modify page using "doc" as "document"
  7. }
  8.  
  9. window.addEventListener("load", function(){
  10.     // Listen to first page/tab
  11.     set_pageload(gBrowser.mPanelContainer.firstChild.firstChild)
  12.     // Listen to other pages/tabs as they are opened
  13.     gBrowser.tabContainer.addEventListener("TabOpen", add_tab, false)
  14. }, false)

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