# Firefox Sync Firefox Sync permits synchronize plugins, tabs, bookmarks, favorites, history over many Firefox instances. ### Firefox configuration #### Firefox desktop In Firefox URL bar put: `about:config`. Search for: `services.sync.tokenServerURI`. Replace the URL by: https://mydomain.tld/path/token/1.0/sync/1.5 Create an account at Mozilla: https://accounts.firefox.com/signup #### Firefox mobile Install the plugin `fxa-custom-server-addon`.