Twitter - The Media could not be played
I have cleared browser, refreshed Firefox and disabled Add-Ons.
Unfortunately, I am still receiving the "The Media could not be played" message for all videos on Twitter.
Everything works correctly in Chrome.
I even attempted to download the "Media Feature Pack" for Windows 10 (1903). Unfortunately, it is not available when I click Add Feature.
I believe this all started after I updated Windows 10 to 1903.
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about:config
and then set security.csp.enable = FALSE fix the problem.
Did you check the Web Console for possible error messages and warnings?
If you block (third-party) cookies very strict then you can get cross domain issues.
Just to be sure:
Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.
- switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
- do NOT click the "Refresh Firefox" button on the Safe Mode start window