User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:94.0) Gecko/20100101 Firefox/94.0

Steps to reproduce:

After launching the program, open the settings, preferences window

Actual results:

The program freezes. I found that as long as I open the set preferences window, regardless of whether I close the window afterwards, the memory usage will increase rapidly until the program crashes. I uninstalled all language packs and plugins. Only keep the default language pack (Chinese).

Please report your results with 91.4.0, just released a couple hours ago.

Note, if you have installed the Chinese locale version of Thunderbird, then you do not need the language pack.

Likely dupe of bug 1642415 which should be fixed in 91.4.0

Thank you, I installed version 91.0.4, and this problem has been resolved at this time.