1) As a first step, make sure you're using a supported, up to date browser. The Twitch.tv site is currently developed for the latest versions of the most popular browsers, you can find a specific list here: https://help.twitch.tv/s/article/supported-browsers
  2) Replicate this issue in an incognito window/private browsing mode while your browser extensions are disabled. 
  3) Log out of VPNs or similar software which might reroute requests through an IP address other than your own (how to do this will depend on whatever software you're using).
   4) Avast Antivirus, AVG Anti-Track, and similar software may also affect your connection - make sure to add Twitch as a trusted website or disable it temporarily to see if that resolves it.
   5) Try clearing your browser’s cache and cookies (you’ll need to log into your account again). You can find instructions on how to do this depending on your browser here: https://help.twitch.tv/s/article/supported-browsers
   И ниже мой ответ:

При попытке войти в аккаунт twitch появляется ошибка о том что браузер не поддерживается. Я попробовал множество вариантов(какие то были описаны на сайте twitch, какие то предложены технической поддержкой twitch). Вот некоторые из них: 1) Убедитесь, что используйте последнюю версию браузера. 2) Отключите все расширения. Особенно это касается расширений для разработчиков или схожих типов расширений. 3) Очистите кэш и файлы cookie. 4) Перезапустите свой браузер и повторите попытку. 5) также я пробовал запустить с включеным vpn и без него Ниже представлены предложения от тех. поддержки twitch: 1) As a first step, make sure you're using a supported, up to date browser. The Twitch.tv site is currently developed for the latest versions of the most popular browsers, you can find a specific list here: https://help.twitch.tv/s/article/supported-browsers 2) Replicate this issue in an incognito window/private browsing mode while your browser extensions are disabled. 3) Log out of VPNs or similar software which might reroute requests through an IP address other than your own (how to do this will depend on whatever software you're using). 4) Avast Antivirus, AVG Anti-Track, and similar software may also affect your connection - make sure to add Twitch as a trusted website or disable it temporarily to see if that resolves it. 5) Try clearing your browser’s cache and cookies (you’ll need to log into your account again). You can find instructions on how to do this depending on your browser here: https://help.twitch.tv/s/article/supported-browsers И ниже мой ответ: 1) I use a supported browser (Firefox latest version) 2) I tried to log in incognito mode and nothing worked either (no extensions installed) 3) I tried to log in to my account with and without VPN 4) I don't have any antiviruses 5) I tried to clear browser data and that didn't help either (running in incognito mode does the same thing)