I have found a workaround for the problem.
The workaround may suggest where the problem lies.
The workaround is: disable drawing on tabs in titlebar; maximise the
main window; close Thunderbird; re-enable drawing of tabs in titlebar.
Result: Thunderbird will now open maximised.
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You received
I have this problem, in 2018, with Thunderbird 60.2.1 on Linux Mint.
Recreating localstore.rdf did not help.
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1265898
Title:
thunderbird doesn't remember
I would like this feature too.
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/525507
Title:
Empty All Trash for Smart Folders
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