I've been working on an open source extension to allow this sort of functionality on firefox (all OSes). <a href="http://overstimulate.com/articles/search-results-in-firefox" rel="nofollow">http://overstimulate.com/articles/search-results-in-firefox</a><p>If interested, the code is at <a href="http://github.com/anotherjesse/searchy" rel="nofollow">http://github.com/anotherjesse/searchy</a> - unfortunately the panel code for Firefox 3 is pretty crappy, and it is too easy to kill X11 responsiveness on linux. (firefox crashes with focus grabbed so you have to switch to another virtual console and kill firefox)