What other device are you syncing with? '''FYI... Firefox Sync IS NOT A DATA BACKUP SERVICE''' Sync info... '''Firefox browser sync''' Firefox lets you see your bookmarks, your browsing history, your saved passwords and more, no matter which device you’re using. https://www.mozilla.org/en-US/firefox/features/sync/ '''What is Firefox Sync and why would you use it''' https://hacks.mozilla.org/2018/11/firefox-sync-privacy/ '''Sync is not a backup tool but it is a good sync/transfer/move tool''' https://support.mozilla.org/en-US/forums/contributors/707681 https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer https://support.mozilla.org/en-US/kb/how-do-i-choose-what-information-sync-firefox Also see similar thread. https://support.mozilla.org/en-US/questions/1485795#answer-1703446

I'm attempting to sync with my desktop pc so windows I also have a second android device but that one syncs just fine. The information I'd like to get is the open tabs on my desktop.