Still waiting for add-on support before you upgrade to the new Firefox? Mozilla employee Deb Richardson has a list of some of her favorites already boasting version 3 compatibility.

Richardson’s holiday weekend blog goes through her top 20 RC1-ready add-ons, including Adblock Plus — perhaps the best add-on you’ll ever download — along with Download Statusbar , Faviconize Tab, and Mouse Gestures.

She also profiles a few obvious favorites for the blogging crowd, like Shareaholic — intregrating Digg, del.icio.us, and Twitter into your browser — and TwitterFox, which creates a special, easy-to-access interface just for Twittering.

You can check out Deb’s entire list here.