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Learn how to transfer your browser data when switching devices using Firefox Sync. Back up your bookmarks, history, passwords, etc. with your Mozilla account.
Firefox automatically updates itself by default, but you can always do a manual update. Learn how to update Firefox on Windows, Mac, or Linux.
Firefox issues an insecure password warning when a web page's login form is not secure and your information could be stolen.
This page explains the error: "Website will not allow Firefox to display the page if another site has embedded it"
