This seems to be a different subject, or you’re just making up new criteria on the fly 😂
Firefox has finally opened up their larger add-on repo on Android. It seems to be slow going(?) but syncing extensions across desktop and mobile should eventually be possible.
Use Firefox with a Mozilla account, sync bookmarks between browsers.
Since you already rejected xbrowsersync, I’m guessing that’s not the answer you want but honestly, who needs a web client if you’re syncing right into your browser?