Thanks for the informative responses!! My questions generated quite a bit of unintended controversy, tho. I "Reloaded" Synaptic, removed FF 2.0, restarted my computer (probably unnecessary, but I wasn't sure). Installed FF3.6.6., but when I attempted to start from the menu, the FF 3.6.6 icon flickers in the kicker panel then disappears, but the program doesn't start. Tried loading from the command line "Couldn't load XPCOM" (quote, not shouting). I will research this on my own for now.
Anyway, this issue resulted in my installing Opera, which as soon as I loaded the first page informed me I was using an old version and offered me an update to download.
At this point, I will just stick with Opera 10.1.1. Very fast, slick, clean interface!!
Wanted to give you feedback and thank you, forum members, for your help!