URL: https://www.epicgames.com/id/login/mfa?lang=de&redirect_uri=https%3A%2F%2Fstore.epicgames.com%2Fp%2Fsongs-of-conquest%3FpurchaseIntentId%3D3a18db06dff0465b8a58308aa29020a0%257Cc2f05f471b6f43cc8e864199f2503bc2&client_id=875a3b57d3a640a6b7f9b4e883463ab4
Browser / Version: Firefox 151.0
Operating System: Linux
Tested Another Browser: Yes Chrome
Problem type: Site is not usable
Description: Unable to login
Steps to Reproduce:
- Try to login into your epic account (from a new device etc. though) and somehow trigger the confirmation mail (multi-"factor" authentication).
- Enter the 6 digit code exactly as stated in the mail and send.
You get a message:
Der Sicherheitscode ist ungültig oder abgelaufen.
Further STR: In my case I tried to "purachase" the currently 0 euro game https://store.epicgames.com/p/songs-of-conquest?lang=de
Screenshot

I originally reported this on webcompat/web-bugs#224085 but as they could not find out what's the problem and I could not reproduce it in a clean Firefox profile, I went to the biiiiig hurdle of disabling extensions etc. to find it's apparently caused by this Firefox extension.
Epic Games is also a major website, so this is a major problem.
BTW using Consent-O-Matic did not cause any problems.
URL: https://www.epicgames.com/id/login/mfa?lang=de&redirect_uri=https%3A%2F%2Fstore.epicgames.com%2Fp%2Fsongs-of-conquest%3FpurchaseIntentId%3D3a18db06dff0465b8a58308aa29020a0%257Cc2f05f471b6f43cc8e864199f2503bc2&client_id=875a3b57d3a640a6b7f9b4e883463ab4
Browser / Version: Firefox 151.0
Operating System: Linux
Tested Another Browser: Yes Chrome
Problem type: Site is not usable
Description: Unable to login
Steps to Reproduce:
You get a message:
Further STR: In my case I tried to "purachase" the currently 0 euro game https://store.epicgames.com/p/songs-of-conquest?lang=de
Screenshot
I originally reported this on webcompat/web-bugs#224085 but as they could not find out what's the problem and I could not reproduce it in a clean Firefox profile, I went to the biiiiig hurdle of disabling extensions etc. to find it's apparently caused by this Firefox extension.
Epic Games is also a major website, so this is a major problem.
BTW using Consent-O-Matic did not cause any problems.