When you log into Firefox on a new or reinstalled system, bookmarks and saved passwords should sync automatically—but sometimes they take a little time. Make sure: You’re fully signed into the correct Firefox account. Sync is turned on for Bookmarks and Logins & Passwords in Firefox settings. You’re using the latest version of Firefox. If everything is correct and nothing shows after a while, you can try signing out and back in or checking your Firefox account on another device to confirm the data is still in your account.