This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

HTML5 streams are not working on twitch.tv and some other sites.

more options

I'm avoiding flash player. Twitch.tv should work fine (and works fine on Edge, with flash disabled). For some reason i keep getting error "no supported video backend available; Flash is not installed" I tried various solutions like clearing cache, disabling addons, reseting firefox, editing about:config media.xxx etc. The problem exists on two computers (using sync).

I'm avoiding flash player. Twitch.tv should work fine (and works fine on Edge, with flash disabled). For some reason i keep getting error "no supported video backend available; Flash is not installed" I tried various solutions like clearing cache, disabling addons, reseting firefox, editing about:config media.xxx etc. The problem exists on two computers (using sync).

All Replies (2)

more options

Most of the Twitch.tv streams is still using Flash Player embedded for video as only the controls and chat are html5 since June and July 2015.

Twitch is planning to change to HTML5 for streams this year sometime.

more options

That's not true. Every twitch stream could be viewed without flash. I'm talking not only about twitch, youtube works fine though