This article refers to a new version of Firefox Account which is available starting with Firefox version 67.

This new feature will be turned on gradually in Firefox version 67, so some users may not see it.

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 profile, a verification email has been sent but you haven't clicked it yet.

Logged out (not syncing)

If the profile is black with a white background, you are not logged in to Firefox Account and your information is not syncing.

If the profile is white with a black background, you are signed in and Firefox is currently syncing.