Hello there, Firstly you would need to create a Firefox Sync account. 1. Click the "Menu" button on Firefox for desktop and then click "Sign in to Sync 2. Click the "Get Started" button 3. Fill out the form to create an account and click "Next 4. Check your email for the verification link and click on it to confirm your email address. Secondly you would need to sign up for Firefox Sync on your Android device. Please follow the link to find out how: https://support.mozilla.org/en-US/kb/how-do-i-set-up-firefox-sync#w_part-1-create-a-firefox-sync-account Hope this helps!