Rated 5 out of 5 stars
I had thought that the extension had bugs, but it turns out that was because I like to put the buttons from the Mail Toolbar on the Menu Bar. Doing that makes it so that the order of the buttons isn't maintained. However, that's not a standard way of using the extension, so it was my fault. I moved the buttons back onto the Mail Toolbar and now everything works fine. I highly recommend this extension.
Care to report the bugs so that I can fix them? I am only aware of a four, two of which I have already fixed and they only effected one button each.
I am actually so far quite happy with the latest release. I made some major internal changes, but have had fewer bug reports compared to previous releases, and they are less serious too.