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Stop using Opera Browser and Opera GX
(www.spacebar.news)
This is a most excellent place for technology news and articles.
I'm confused since Firefox Sync has been letting you sync/backup your passwords, bookmarks and history for a decade or two at this point, and you can even self-host the sync server.
I don't know the complete FF password manager details (Bitwarden user here) but where does Firefox fall short for you?