I've been trying to reproduce the problem using builds from firefox.com.cn, however I don't know where to get older versions of the bundled addons such that I can check for addon updates in order to reproduce the problem.
What I've observed is that when I do an update from 6.0.2 to the latest version, there is a dialog for addon updates, which it then downloads and the application starts up fine with no missing addons.
I've been trying to reproduce the problem using builds from firefox.com.cn, however I don't know where to get older versions of the bundled addons such that I can check for addon updates in order to reproduce the problem.
What I've observed is that when I do an update from 6.0.2 to the latest version, there is a dialog for addon updates, which it then downloads and the application starts up fine with no missing addons.