Looking for logging into the Can't With Firefox 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 Can't With Firefox site. After that you can login as usual with your login credentials.
https://support.mozilla.org/en-US/kb/fix-login-issues-on-websites-require-passwords
https://support.mozilla.org/questions/1242354
https://support.mozilla.org/questions/1230168
https://support.mozilla.org/questions/1203563
https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can
https://support.mozilla.org/questions/1204315
https://support.mozilla.org/questions/1198823
https://support.mozilla.org/questions/1198045
https://support.mozilla.org/questions/1184857
https://itstillworks.com/cant-login-yahoo-mail-firefox-33455.html
https://www.reddit.com/r/firefox/comments/7j6pr9/cant_log_on_twitter/
https://www.reddit.com/r/firefox/comments/75n5a0/ive_tried_everything_i_cannot_login_to_twitchtv/
https://github.com/vaadin/full-stack-starter/issues/7