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This video is either unavailable or not supported in this browser. (Error #4000) / The media could not be played.

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I can't watch any Twitch streams and videos on Twitter give me an error. This does not happen to me while using other browsers, only Firefox.

Here is what I have tried:

I refreshed the page.

My drivers are up to date.

I do not have any media players opened.

I deleted cache and cookies.

Any help would be appreciated, thanks!

I can't watch any Twitch streams and videos on Twitter give me an error. This does not happen to me while using other browsers, only Firefox. Here is what I have tried: I refreshed the page. My drivers are up to date. I do not have any media players opened. I deleted cache and cookies. Any help would be appreciated, thanks!
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Make sure you are not blocking content.

Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?


https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop


Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

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Are there more specific messages about playing media in the Web Console ?

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FredMcD said

Make sure you are not blocking content. Start Firefox in Safe Mode {web link} A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop


Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

Tried safe mode and the problem is still there

I also deleted cookies and cache