[mordero]

Something like this: http://wiki.github.com/bard/mozrepl ?

[s2r2]

or like this: http://surfraw.alioth.debian.org/ (works fine with "minimalist" browsers)

[3ds]

Yes! That is the most amazing thing I hadn't known I wanted to have :D It takes greasemonkey and jetpack to a whole nother level. Awesome awesome awesome! If I didn't have a very important test tomorrow I know I'd spend hours messing with firefox till nothing was left.