Yes,   unfortunately you'll need to create a new account   -   so sorry   ! 'Hope you have backed up your data   .......

Thanks for this disappointing piece of information :) Is there a way to transfer data from one account to the other? Particularly the saved login information. Thanks

If,   before creating a new account,   you've backed up your data,   they will automatically be transferred to your new Sync account.

But exactly where do I change the email address?

squonk said

But exactly where do I change the email address?

I sent you a Private Message .....

Yes! You can change the email address of your Firefox account.

Read below steps or go to https://support.mozilla.org/en-US/kb/change-primary-email-address-firefox-accounts

1. Go to the following URL. https://accounts.firefox.com/settings?canChangeEmail=true

2. Add Secondary Email if you have not yet added any. (complete the verification also)

3. Refresh the page and you can see "Make Primary" option against your secondary email address. You can click on it to change the email address of firefox account.

Thanks! Obviously a recent feature :)

Yeah : D

shashikanth171 said

Yeah : D

Thank you   !

But the OP posted this question back in May .......