If you believe a bug needs to be addressed in a release, follow these steps:
Set the Tracking Flag
Use ? to nominate the bug for tracking for the specific Thunderbird version
Provide a justification explaining why the bug needs to be addressed in the release.
Mark the Status Flag
Set the corresponding version status flag to affected.
Release Management will review bugs nominated for tracking. If they agree that the bug requires investigation for the release, they will change the tracking flag from ? to +.