My favorite Firefox plug-in of the moment is FaviconizeTab, which takes your tabs and makes them iconized.

So this:

becomes this:

… which is probably only important if you’ve got 25 tabs open at any given time. But, I do, and I think it’d be better if you surfed that way, too. (Remember life before tabbed browsers? There was so much waiting then…)

There’s a setting that will auto-iconize pages from a particular site, so if you’re always in Gmail, you just hand it “https://mail.google.com/*” and everything Gmail is iconized all the time.