Re: Thunderbird 3.1.2 Rated 4 out of 5 stars

1. Install the add-on Mr Tech Toolkit
2. right-click stylish in the add-on window
3. chose adjust compatibility (or similar, I don't know the English wording)
4. Restart and be happy :-)
It works without update.

This review is for a previous version of the add-on (1.0.11).