The Mozilla add-ons site has been re-designed, and we finally get the ability to group add-ons together into Collections, which can be installed all at once. Share all your add-ons with others, or make your own Collection to easily install your tools to new instances of the browser.
Now if they would only add automatic sync with my add-ons and settings.
By the way, if you aren’t using FEBE, you should. I have it back up all my Firefox settings nightly to box.net, so if my computer ever crashes I can quickly and easily get everything back. These days, a ton of my stuff is actually stored in the browser, so losing it is quite a hassle.