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Librewolf is Firefox but better
(feddit.de)
I use Arch btw
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That only works if you use the 3 dot menu and press Quit, unless there's another setting I don't know about.
It works when you close the window, with the exception of Mac which requires you to fully quit, just like any other Mac application.
I am 100% positive that it is NOT working for me upon fully closing Firefox on Android.