Rated 5 out of 5 stars

With TB 2.0.0.22 & lightening 0.9 & Provider 0.5.2, TB locked for me at startup recently. Figured it was lightening as the title in the task manger for thunderbird included July 2009. I started from winkey+r with thunderbird -jsconsole, the error console showed an error briefly but then did not paint and I could not show this again after a couple of reboots. Turns out Thunderbird has a safe mode shortcut created at installation, going in and disabling lightning (& also provider solved it). What a disaster, cost me an hour today, very disappointing.

Others have been seeing this issue too
http://forums.mozillazine.org/viewtopic.php?f=46&t=1205445

This review is for a previous version of the add-on (0.5.2).