It’s possible to use a @nextcloud server (or a WebDAV server) to sync your bookmarks. It can also be used for personal file-sharing & calendaring (and other stuff) !
… it’s also possible to use Firefox.
Quoting @silvermoon82@strangeobject.space: https://strangeobject.space/@silvermoon82/110969122337810598 #retoot
If you want a client or a browser extension you could take a look at @floccus
There’s a more complete list of clients there: https://github.com/nextcloud/bookmarks