Check out this great blog post on how to maximize the use of your Firefox tabs. I personally use Tab Mix Plus on one of my (crappy) Vista computers and it helps Vista from crashing Firefox. (although it still crashes)
Every Firefox user spends a lot of time dealing with tabs. Thus, improving the tabs directly adds to the browsing experience. You can make them better, faster, beautiful and lot less ovewhelming. So here you go, 7 powerful addons to improve your tabbed browsing.
Other interesting stuff at Zedomax.com: browsing-power, DoItYourself!, Educational, firefox-hack, firefox_add_ons, Hack, Misc, tab-extensions, tabs, WebApp, Zedomax