Firefox 0.9.1 is coming
Ben Goodger has announced that there will be a 0.9.1 bugfix release. It will fix several theme/extension manager bugs and include an updated version of Winstripe that isn't on the trunk yet.
There is a 0.9.1 mini-branch off of the Aviary branch at the point of the 0.9 release. 0.9.1 branch checkins. Thunderbird 0.7.1 will be released from the same mini-branch.