Shrekify sɣur Aelexe

Randomly replaces a single image on 1% of pages with a scaled image of Shrek, blending in (almost) seamlessly with the surrounding page.

If you love Shrek (or dislike someone) then this is the addon for you! (or whoever's computer you have access to)

Will support settings configuration once the next Firefox version is released which introduces options_ui support.