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https://support.mozilla.org/en-US/kb/how-do-i-choose-what-information-sync-firefox '''What information can I share across my devices?''' You can choose to sync the following information on your devices: Bookmarks: this allows you to access all your favorite sites on all your synchronized devices. '''History:''' this allows you to access sites you have visited in the past on all your synchronized devices. Open tabs: your open tabs on other devices can be accessed from the Synced Tabs button on your computer, and in the History screen on your Android device. See the View synced tabs from other devices article for details. Passwords: this synchronizes the usernames and passwords you use to log in to websites. If you use a Primary Password, see Use a Primary Password with Sync for important information on how Sync and the Primary Password interact.