Are both devices connected to the same Firefox Account? *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-types-information-sync-firefox You can open <b>about:sync-log</b> via the location bar to see if recent Sync logs are available. You can upload the file to a website like Pastesite if you can't post the content of the file in a reply. *https://pastesite.org/