Where are we talking about here?

Is this about Sync?

• https://support.mozilla.org/en-US/kb/secure-firefox-account-two-step-authentication

If you aren't able to access the account then you might not be able to fix this easily.

Any luck here with a possible password reset?

• https://accounts.firefox.com/signin

Two-step authentication with images :

https://blog.mozilla.org/services/2018/05/22/two-step-authentication-in-firefox-accounts/

I tried it. It somehow worked. Then I had to disable the authentication thing right? The red button "disable" is disabled itself. It doesn't seem to work. I then tried to change the authentication code and it did show me some long random code. I copied it like a normal fonctionning human would do and paste it in the code text bar where you should when you're logging in, and it's not working. You answer was helpful but it's like when you open a locked door and you found another one behind it. Thanks anyways

Try to reset the Firefox Sync password to see if that gives access to the account.

• /questions/1226620 I forget recovery and security code