If you have Firefox 3 or IE7, you can apparently replace in the address bar the url with one line of javascript to make the current webpage you are viewing editable!  Crazy, I know, but it works!  You can highlight, delete, type new text, etc.  This might become a very handy tool, especially for some of my co-workers who are not as tech savvy at editing mockups or correctly communicating their wanted revisions to currently live pages.

Try it for yourself:

javascript:document.body.contentEditable='true'; document.designMode='on'; void 0

Unfortunately, you can’t save the changes (unless you screenshot it) but it’s cool and scary nevertheless.

This is the original blog post from where this information came from:

http://www.blogstorm.co.uk/cut-and-paste-one-line-of-code-to-make-any-website-editable/