If you close, shut down or exit Thunderbird (or Thunderbird stops on its own) and you see the Thunderbird '''process''' is still seen running in MS-Windows task manager (taskmgr) or linux process status (ps), then you have a shutdown hang. Or perhaps you encountered a message that "Thunderbird is already running". The "already running" message can be a symptom that is not related to hangs, so it is essential that you check taskgmgr or ps.
There are several reported [[#Bugs|Bugs]], but please only comment in a bug, or report a new one, using detailed information which you can obtain from the [[#Symptoms|Symptoms]] list below. In other words, just reporting or commenting that you hang is not useful - please support you your report and comments with data.
= Symptoms =