I've seen this behavior in the search bar portion (automatically highlighting the text you just typed so your next keystroke deletes it) for several Ubuntu releases. Really annoying as I use that for searches all the time. My workaround has been to use the firefox build from Mozilla. I've only seen this problem in Ubuntu's firefox build so far. I'm currently runing Ubuntu FF 3.6.3 (lucid) on this machine, but my others are running Mozilla FF 3.6.3.
I've seen this behavior in the search bar portion (automatically highlighting the text you just typed so your next keystroke deletes it) for several Ubuntu releases. Really annoying as I use that for searches all the time. My workaround has been to use the firefox build from Mozilla. I've only seen this problem in Ubuntu's firefox build so far. I'm currently runing Ubuntu FF 3.6.3 (lucid) on this machine, but my others are running Mozilla FF 3.6.3.