Unable to LogIn or SignIn via Firefox on Twitch.tv - Help / Off-topic - Twitch Developer Forums

Hello guys, i do not know what i can do to logIn or SignUp myself. Everytime i try it i get a transparent violet overlay with a x-mark on the top right but there is nothing to type username or password. I try to clear the cache of my Firefox browser also delete ALL cookies connected with Twitch. Is there any help except changing the browser to IE or Chrome?

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