Making a backup every 60 days seems to be sufficient to keep all history. sqlite doesn’t reuse old ids (I think?) so merging the backups shouldn’t be too hard.
But they haven’t tested it, also I wonder if once you do that successfully, Firefox will just delete all the extra records at the next startup, so idk
They said you can merge without conflicts:
But they haven’t tested it, also I wonder if once you do that successfully, Firefox will just delete all the extra records at the next startup, so idk