Hi

Did you have them synced to another copy of Firefox on another device? Otherwise it may not be possible to recover them.

I updated Firefox browser on my android, too, and my Tabs and bookmarks are gone. Is there a way to get them back? Thanks

Thanks for responding. No, I don't have them synced. (I don't understand why the browser developers would design a system that loses our information when we update the browser)

Is there no backup of the information, or a data folder in my android to find the information, please? Thanks.

Not that you could easily get to or with no risk to your device, no.

You're saying that I would have to root my device, right?

Yes, but I would not recommend it as it could lead to greater and worse data loss.