The MozQA community is holding a Testday on Friday, June 11th, for users interested in the use, development and/or testing of the Addons Manager Rewrite for Firefox. We're going to have the awesome Firefox QA team available to help users perform exploratory testing for that new feature and just generally chat about it with the community via IRC Chat (channel #testday on irc://irc.mozilla.org). So, if you're interested, come on by anytime between 7AM to 5PM PDT that Friday!