Hello. I am finding on different devices i have that firefox won't let me do things i could do before. Example. On my cellphone. I can't login to twitch.tv nor can i get into my yahoo mail account. It says i have an unsupported browser and i didn't have that problem before. The twitch problem is the same on my pc. I can't login. The login and my credentials are there but the button won't let me log in. Please help me. Thanks. Susan