In FireFox you should be able to open the developers tool by pressing F12, keep that open and login again. Now check the console tab or network tab and see if there are any red errors.
I tried to login but it displays the incorrect username/password message so the script itself isn't broke. My guess is that a plugin is causing this. Disable any plugins related to the login or disable all of them and then enable them one by one to find out which one is causing this.
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