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Firefox Sync will not SyncOnly bookmarks will Sync. Bookmarks sync but Plugins, Extensions, and Add-ons will not. How do I fix this?

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I installed Firefox 64-bit on a new computer and logged into my Mozilla sync account. Logged in, verified, and I got a message saying everything will sync in a moment. Sure enough my bookmarks are all there....then I check my plugins, add-ons and extensions....nothing. I logged out of my account on all my computers then logged back in. Nothing. I deleted my online account and then recreated it and logged back in on all computers. Nothing. I even deleted my user profile as suggested somewhere else and created a new one. Still, nothing. What gives man? How do I get sync to work?

I installed Firefox 64-bit on a new computer and logged into my Mozilla sync account. Logged in, verified, and I got a message saying everything will sync in a moment. Sure enough my bookmarks are all there....then I check my plugins, add-ons and extensions....nothing. I logged out of my account on all my computers then logged back in. Nothing. I deleted my online account and then recreated it and logged back in on all computers. Nothing. I even deleted my user profile as suggested somewhere else and created a new one. Still, nothing. What gives man? How do I get sync to work?

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Plugins won't sync. They aren't installed in Firefox, but rather they are in the operating system.

Add-ons are Plugins, Extensions, and Appearance items - themes.

And Extensions aren't actually synchronized, they are installed from the Mozilla Add-ons website based upon what Sync "tells" the newly connected device.

about:sync-log may reveal what's not happening during the Sync process.