Unlike most browser's sync systems, Firefox's is actually end to end encrypted. Though when I log in on a mobile device I don't even have to enter the password

Unlike most browser's sync systems, Firefox's is actually end to end encrypted. Though when I log in on a mobile device I don't even have to enter the password so I kinda doubt it passes the mud puddle test. But at least the info is not just stored in the clear ready for datamining like Chrome or Edge do. Though Chrome has very recently added e2e for its passwords but not for the bookmarks.