"Can’t be enabled on Firefox for Android" Would be nice if you mentioned that in the description instead of one having to dig for it under issues in github.
You need to FIX IT ON https://addons.mozilla.org/en-GB/firefox/addon/about-sync so that it shows NOT AVAILABLE for Android/Your Platform - not just on github. So as to prevent other people wasting their time. Most users would not even think to go to github and look under issues.
I'm not that technical to understand all its details, but somehow It tells me if there any errors or issues with sync service, handy when dealing with privacy settings, most of the time FF can't sync probably when some settings are changed, ex. agent, spoofing time/date .. etc
I had reason to quickly test this out. It is a lot easier than looking at the raw sync log. I also note it has an anonymise option for report printing which could come in handy if Sync data needs sharing