After Firefox completely died on me for some reason, I am now completely in love with the SessionSaver .2 extension. I started firefox and it loaded all my tabs and windows exactly where I had left off. Being one that frequently keeps >20 pages open at any given time, this is a lifesaver!

I also just recently installed miniT, which allows me to dragreorder my tabs - one feature I’ve always thought was lacking in Firefox.

I came across all of these at rebelpixel.com.