How do I backup my settings, and restore them to another device?

I'm migrating a ton of mostly open-source apps: AVNC, K9-Mail, Antenna Pod, OsmAnd,... They all have a way to export their configuration to a file (typically without passwords, that would be fine) , and then import it back. I just push the files to a folder that gets synced directly to the new phone using Syncthing, and I'm almost done. I don't understand why a significantly larger project such as Firefox for Android doesn't have this option.

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Thanks for your reply and clarification. Honestly, I knew who the audience here was, and still couldn't resist venting me disbelieve.

I guess, after more than 20 years with Firefox (Desktop and Phone), it's time to start looking elsewhere. Every phone migration has been a pain. Maybe I come back to suggest this if no other browser I like offers this. I'd be very, very surprised if this very feature hasn't been suggested multiple times in the past already.

We can close the question, I guess.