I seriously doubt it will happen any time soon, but rebooting from Android into Windows 10, then back into Android on a modern phone... that would be the holy grail... no need to give up anything or choose one over the other... no need to argue which is better.
Here's a useful tip, if anyone else has kept their old Favorites bookmark folder, I've kept mine since Windows 95 to today's Windows 10, you can use this app
https://play.google.com/store/apps/details?id=com.zapek.android.stuntzurl
to tap on your Windows internet shortcut on your phone and launch any bookmark link to open in your mobile browser (they can each have their own icon as a bonus).
(That app has just been updated and has not been working since the old Android days, I accidentally found out the other day the author finally made it working with modern Android versions.)
And back on Windows, you can have one "physical" location your Favorites bookmarks and have them show up in Firefox in an identical unified Favorites folder which is valid for both Windows Internet Explorer and Firefox, making any synchronization between the two unnecessary:
http://www.iosart.com/firefox/plainoldfavorites/