Rated 3 out of 5 stars
When I start Thunderbird, the down arrows next to write, reply and forward do not exist. Turing Identity Chooser off then on again temporarily solves this problem.
Edit: A day or so later... the turn off and on again doesn't work any more. I did add the CardBook address addon.
BTW, thanks, speedball2001 for the link.
please follow the issue on GitHub https://github.com/speedball2001/identitychooser-mx/issues/3
We're working on it even though it's difficult to reproduce since it seems to be happen only on some machines.