How do I know the status of my sync?
The Firefox Account icon on your toolbar will give you the status of Firefox Sync.
Waiting for email verification
If an envelope appears in your Account icon, a verification email has been sent but you haven't clicked it yet.
Logged out (not syncing)
If the icon is black with a white background, you are not logged in to Firefox Account and your information is not syncing.
Signed in and syncing
If the Account icon is white with a black background, you are signed in and Firefox is currently syncing.