Nav Aulakh

In-browser page editing

Here's a neat JavaScript trick that makes a web page editable. It could be used for adding/deleting filler content to see how the page layout looks; helpful for front end developers. Not sure if Firebug has it implemented already.
  1. Open up the webpage you want to tinker with.
  2. Copy and paste the following in the address bar of your broswer and hit enter or click go.
javascript:document.body.contentEditable='true'; document.designMode='on'; void 0
Source: http://azure.ironie.org/291-edit-any-web-page-in-a-browser