Usually if you are creating a fresh new Firefox Account, the site wouldn't know about the primary email address of your old account. Unless the address you are using was set up as a secondary address on the old account?

That was the case, but the primairy email address was shut down because I changed from provider and so that does not work anymore. So I deleted this account on Firefox too, but for some reason Firefox seems te remember the old account and when I now try to get access to Firefox with the new mail address, it does not recognize my new email address. It changes automatically to the old (now closed) emal address and asks for y old password which I don't remember anymore.

I don't know whether there is a way to free up that secondary email address to use on a new account, or whether you will need a third address. Which account are you using to post here, though??

I now use the Firefox account of my girlfriend to communicate with you I tried te reinstall my password, but then Firefox also asks for my original primary email address, so I get stuck there too.

If you used Sync before with this profile you can try to delete the signedInUser.json file in the Firefox profile folder and delete the Weave folder with Firefox closed.

You can create a new profile as a quick test to see if your current profile is causing the problem.

See "Creating a profile":

• https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.

• https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile