Can't Log In on Firefox Answered

I can't seem to log in to the site when using Firefox 54.0.1. After clicking on the "log in" button and entering my username and password, I get redirected to the homepage. I can log in using Safari, so I don't think the issue is with my account. I also tried clearing my history and deleting my cookies, but the problem still persists. Any ideas as to what's going on? Thanks!