The most straightforward solution would be to switch to firefox in place of the mozilla web browser.
If you wish to amend your current setup, here's a quick tip: moz isn't recognising tb as a whole separate application, it thinks it's another mozilla instance. To get around this, there are certain command-line options associated with mozilla/thunderbird: I would direct you to the output of "mozilla --help" and "thunderbird --help". But just switch to firefox.
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