Ubiquity in Firefox 4 Rated 5 out of 5 stars
At one point there was a lot of buzz that ubiquity would be, at some level, integrated into firefox 4. This seems to have completely fizzled. And to make things worse, you can't even use this version with the new browser.
However, if you're looking for some fix, may I suggest going over to mozzila's blog entry here : http://mozillalabs.com/ubiquity/2010/03/10/community-maintained-version-of-ubiquity-for-firefox-3-6/ . There you can find an xpi link that if you open with firefox will give you dearest ubiquity back.
I had a nice little review glorifying ubiquity all written up, but it failed to post and I'm all out of effusive praise for the time being. To state it simply, Ubiquity is great, I consider the biggest leap in web browser technology since tabbed web browsing, and it shouldn't have been dumped like it was. Until someone can convince me that there is a better way to search the internet I will be rockin' this old xpi.