I’ve finally uploaded the final version of Mailbox Alert 0.13 to AMO, it’s taken long enough.
Sorry to all the people not having their requests for changes granted ;)
Maybe next version.
But the changes are big enough, see the Changelog. Most important are a way more efficient way to store settings, and a whole new internal alert system (kind of based on thunderbird 2’s, but IMHO more elegant).
If you can’t wait for AMO to review and accept it, get it here.