What are your settings? see screenshots When you log into the 2nd computer, what you have checked in the options should start populating the browser on the 2nd computer. As a test, download a different version of Firefox[https://www.mozilla.org/en-US/firefox/channel/desktop/ (Beta, Dev, or Nightly)] on the 1st computer. '''Make sure to install in a different directory than your current install. ''' Log into your account in the new browser and things should start syncing.