Twitch is now blocking firefox

When your browser connects to a website, it will tell the webserver what type of browser you are using in the HTTP headers. This can be used for serving a special web page for browsers with quirks, or it can be used to block certain browsers.

It may look something like this:

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:123.0) Gecko/20100101 Firefox/123.0

But you can use an extension like this one to spoof your user agent and send out one that corresponds to a chromium browser.

Something you shouldn’t have to do in order to use the internet.

There are browser plugins that let you change your user-agent request header to masquerade as another browser (e.g., Chrome).

User-Agent is a string of information that browsers use to identify to a site what browser, version, build, etc you are using.

You can download FF extensions that allow you to spoof a different user-agent, making the site think you're instead using Chrome, as an example.

I login with Librewolf by disabling resist fingerprinting, then disabling all content blocking extensions, then clearing cookies, then restarting Librewolf. When you login, click "Remember Me" and re-enable everything

No problem.

I remembered the security setting Twitch didn't like, as well. It was "Enable ResistFingerprinting". If it gives you any more trouble, check the LibreWolf section in your settings for that. Same deal: toggle off, login, toggle back on.