Login Screen Returns to Blank After I Enter Login & Password

Help. I cannot login to my WordPress website from Firefox/Mozilla. I have the correct password and have talked to Godaddy as well as searched for the last hour and a half online. I can login using internet explorer, but this is unacceptable. I recently installed the extensions ‘ghostery,’ ‘adblocker+,’ and ‘priv3,’ but I removed them in case they were the problem; they don’t seem to have been the issue, but the issue started after I had installed them.
Please help with specific, clear, and detailed instructions if you understand this problem. Thanks.