SRS...under 'tools' in the toolbar, one items should be 'extensions'...that brings up a box showing whatever you have installed (perhaps ONLY GoogleBar for you so far)

look here for an almost complete list. Googling "firefox extensions" will get you lots of places where they are discussed.

For security purposes, (this new alert) they have slightly increased the complexity of installing new ones..(so that naughty sites don't install other stuff using the automated process), but it's mostly just a matter of manually putting .xpi files in the right folder.

There sure are a lot of possible extensions....read before you install. *grin*...(I do love "session saver" which allows me to keep what I had in my tabs just as I left it and not go searching again...(Opera has this built in))

and "tab mix" allows you to control umpty-leven options about how you want tabs to behave....but there are a couple other good tab control extensions, and they don't play well together.