Change famous sites templates with foxReplace

It seems that I've signed my contract with Google
and have started designing their pages .. or I'm a VIP that popular sites are writing about me, actually the story is quite different.
The trick is in the fire fox add-on: foxReplace.
After installing it:

• Press file "Edit", then "Replace" (instead press Alt + F2).
• Write in the left box the phrase you'd like to replace, and in the right one the replacement.

cool trick isn't it?