Looking for logging into the Firefox Forum 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 Forum Problem site. After that you can login as usual with your login credentials.
https://support.mozilla.org/questions/1046732
https://support.mozilla.org/questions/1230205
https://support.mozilla.org/en-US/kb/fix-login-issues-on-websites-require-passwords
https://support.mozilla.org/questions/1206560
https://support.mozilla.org/questions/1210309
https://support.mozilla.org/questions/1242354
https://support.mozilla.org/de/kb/hilfe-durch-unsere-gemeinschaft-erhalten
https://support.mozilla.org/questions/1235526
https://support.mozilla.org/de/kb/Anmelden-bei-Websites-nicht-moeglich
https://support.mozilla.org/questions/823733
http://de.forum.elvenar.com/index.php?threads/login-probleme-bei-firefox.8713/
https://www.firefox-forum.com/
https://www.dropboxforum.com/t5/Eine-Frage-stellen/LogIn-in-Firefox-59-0-2-nicht-m%C3%B6glich/td-p/273403