Bookmark Sync not working

[jgarciao]

Bookmarks are not syncing properly, I think because of this bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=1577788

It was fixed in Firefox Nightly last month but the version published as flatpak is previous so it doesn't have the fix

Related to #127. If you can't maintain the package anymore it should be advertised so users will look for alternatives. Thank you for your work all this months providing Firefox as flatpak!