Change primary email address on Firefox Accounts
Firefox Accounts now lets you change your primary email address if you have two emails registered.
- Open Firefox and make sure you are signed in to Sync (click the menu button and look for your email address or user name instead of "Sign in to Sync").
- In the menu, click your email address or user name to open the Firefox Account panel in the OptionsPreferences tab.
- Click the Manage account link next to your avatar.
- Click the button next to Secondary email.
- Click the button.
If you haven't already added another email address, see Add a secondary email address to Firefox Accounts.