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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 psto find thunderbird there; if you don't see thunderbird listed, then you do not have a hang.
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 your report and comments with data.
To be most helpful, you will want to
* '''describe your environment''' (which includes steps which may help you avoid the problem)
* '''obtain a hang stacktrace'''
* '''determine steps to reproduce''', a sequence of steps that occur '''before''' you shut down
'''Describe the environment''' - Answer these easy questions in a bug report or posting to support:
# Software tests. Does Thunderbird hang ... :
#* when started in [https://support.mozillamessaging.com/en-US/kb/Safe+Mode safe mode]? If it doesn't hang in safe mode you will want to disable add-ons until you find which add-on is causing the problem, then contact the add-on author.
#** happen without calendar/lightning extension? ({{Bug|532435}})
