To change the email address associated with your Firefox account, follow these steps: 1)Open Firefox and click the Menu button (the three horizontal lines in the top-right corner of the window). 2)Click "Sign In to Sync" and enter your Firefox account login information. 3)Click the Menu button again, then click "Options." 4)Click "Privacy & Security" on the left side of the window. 5)Scroll down to the "Firefox Account" section and click the "Manage your account" button. 6)Click the "Edit" button next to your email address. 7)Enter your new email address and click "Save Changes." You may be asked to provide additional authentication, such as your password or a code sent to your email or phone, to confirm the change. Once you've changed your email address, you'll need to use the new address to sign in to your Firefox account. Make sure to update any other accounts or services that were using the old email address as well. I hope this helps!