While some Apps might provide it, contrary to desktop experience a dedicated “exit button” in Apps is not a thing in Android.
https://www.wired.com/2016/03/closing-apps-save-battery-makes-things-worse/
make the Developer options visible by tapping Settings - About phone - Build number a few times until you are being declared a developer, then enable Settings - System - Advanced - Developer options - Kill app back button.
It’s not perfect, it seems killed Apps stay in the App list you get with the square button, which looks odd, but they are closed. Try to open them, they start from scratch, they don’t return from the simply inactive state they are in when they are not closed.
Anti-Gafam:
how to import shortcuts
Via Firefox Sync with a desktop Firefox (which provides the import feature).
https://www.howtogeek.com/775001/how-to-import-bookmarks-into-mozilla-firefox/
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