Under http://www.mozilla.org/en-US/thunderbird/12.0/releasenotes/ You can see DEVELPER Thunderbird now supports add-ons that provide different types of local mail storage. It should be DEVELOPER instead.
Fixed in r104784, thanks for filing the bug.
Status: NEW → RESOLVED
Last Resolved: 7 years ago
Resolution: --- → FIXED
Product: Websites → www.mozilla.org
You need to log in before you can comment on or make changes to this bug.