Adblock Plus--A must for every Mozilla Firefox user.

Gmail Notifier--sits in the corner, out of the way, and lets me know how many unread messages I have in my Gmail inbox, and when a new message comes in.

Google Wave Add-on for Firefox--same as the Gmail notifier. Handy so I don't have to check Wave all the time for the messages I never have.

Firefox Personas-- <3

Speed Dial--In a new tab it allows for a list of whatever websites you want it to. Kind of like having the bookmarks toolbar, yet different. Also, Ctrl+# will open a new tab with that page, so it's a plus as a keyboard shortcut versus the bookmarks toolbar.

Xmarks--keeps track of my bookmarks, and then syncs wherever else I have it installed, like a portable Firefox or Google Chrome.

Tab Wheel Scroll--appropriate laziness strikes again! I can put my mouse pointer on the tab bar and use the scroll wheel to go from tab to tab, much easier and less strenuous than having to click on the tab or use Ctrl+Tab. I really wish I could add this extension to Chrome.

And then one more I don't think I can mention, as it links to another website.

-CF