Changes

Shutdown hangs, where Thunderbird is still running after shut down, are do not all alikehave the same cause, even if on the same OS. A What is running in the environment, a stacktrace, and a list of steps to reproduce is are all helpful, which in determining what kind of hang you are seeing. This may require some experimentation on your part to develop, but and we know this is not always possible. Reporting But providing as much of the needed information as you can, and how often you see the hang (always, rarely, etc) is important. Also, answers to the following easy questions helps identify the type of hang:# If the problem is reproducible and you have add-ons/extensions installed, does the hang happen with Thunderbird started in [httphttps://kbsupport.mozillazinemozillamessaging.orgcom/Safe_mode en-US/kb/Safe+Mode safe mode]? If it can't be reproduced in safe mode then the problem could be an extension . Experiment by disabling add-ons until you find the cause, and you should contact the extension add-on author.