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Videos won't play

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I am using a new iMac with the latest version of Firefox (100.0.2) Lately when I am reading articles on news sites such as CNN or The Guardian, or on Twitter, when I click on the video the screen goes black and stays black. No video or audio. This is incredibly frustrating. Also, even when I was able to watch videos, the default was that the sound was off. I would like to know how to fix both these issues ASAP!! Thank you

I am using a new iMac with the latest version of Firefox (100.0.2) Lately when I am reading articles on news sites such as CNN or The Guardian, or on Twitter, when I click on the video the screen goes black and stays black. No video or audio. This is incredibly frustrating. Also, even when I was able to watch videos, the default was that the sound was off. I would like to know how to fix both these issues ASAP!! Thank you

All Replies (3)

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Example of the problem link. So others can see if they have your same playback issue.

Helpful?

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You can check the Web Console for relevant-looking messages.


If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block content (Adblock Plus, NoScript, DuckDuckGo PE, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block content.

You can try these steps in case of issues with webpages:

You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.

  • hold down the Shift key and left-click the Reload button
  • press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
  • press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings).

"Remove the Cookies" for websites that cause problems:

  • Settings -> Privacy & Security
    Cookies and Site Data: "Manage Data"

"Clear the Cache":

  • Settings -> Privacy & Security
    Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or userChrome.css 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 Troubleshoot Mode start window

Helpful?

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Hi , I'm on mac as well, but if I try to play videos at https://www.theguardian.com/video everything works fine. (On CNN, I already know that videos will only play if I turn off the Disconnect add-on)

If you start Firefox in Troubleshoot Mode, does the problem still occur? To start in Troubleshoot Mode, go to Help > Troubleshoot Mode.

If the problem does not occur in Troubleshoot Mode, then you can disable your extensions one-by-one until you find out which one is causing the problem. For more info, visit Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

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