Looking for logging into the Firefox Facebook Problem site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Firefox Facebook Problem site. After that you can login as usual with your login credentials.
https://support.mozilla.org/questions/1211864
https://support.mozilla.org/de/kb/Probleme-bei-der-Benutzung-von-Facebook-in-Firefox
https://support.mozilla.org/questions/1090342
https://support.mozilla.org/en-US/kb/fix-login-issues-on-websites-require-passwords
https://support.mozilla.org/de/kb/Anmelden-bei-Websites-nicht-moeglich
https://support.mozilla.org/questions/984326
https://support.mozilla.org/de/products/firefox/fix-problems/websites
https://support.mozilla.org/questions/1202332
https://support.mozilla.org/questions/1168070
https://smallbusiness.chron.com/facebook-not-work-firefox-52757.html
https://stackoverflow.com/questions/46044100/facebook-login-doesnt-work-on-firefox-only
https://www.facebook.com/help/community/question/?id=10208191856536714
https://answers.microsoft.com/en-us/windows/forum/all/cant-login-to-facebook-using-firefox-error/d8d40abe-a92d-4117-8046-e42459df5734