numerous windows open upon start up
When I start up thunderbird, 5 windows open simultaneously. Other online answers suggest closing all windows but one and then choosing "quit" on the hamburger button but I don't have that option, only "exit". Doing this hasn't solved the issue.
Chosen solution
ISTR that alt+f4 has worked for some users.
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Chosen Solution
ISTR that alt+f4 has worked for some users.