www.youtube.com - video or audio doesn't play

[brochignac]

URL: https://www.youtube.com/watch?v=YxRqV17yFU8

Browser / Version: Firefox 151.0
Operating System: Linux
Tested Another Browser: Yes Firefox

Problem type: Video or audio doesn't play
Description: There is no video
Steps to Reproduce:
when I launch a video on YT, I have no video with black screen instead. Same issue with Firefox 149.0. No problems with Chrome.

View the screenshot

Browser Configuration

• blockList: basic
• channel: nightly
• defaultUserAgent: Mozilla/5.0 (X11; Linux x86_64; rv:151.0) Gecko/20100101 Firefox/151.0
• gfx.webrender.software: false
• hasTouchScreen: false
• layers.acceleration.force-enabled: false
• frameworks: {'fastclick': False, 'marfeel': False, 'mobify': False}
• mixed active content blocked: false
• mixed passive content blocked: false
• tracking content blocked: false
• btp has purged site: false

View console log messages

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[softvision-raul-bucata]

What I would do usually to test this kind of issue, is:

1. Type about:profiles in the url bar.
2. Choose Create a new profile.
3. Call it deleteme or anything you please.
4. Then start it. (this way you will be sure that nothing is interfering, no ghost caching etc.)- make sure account sync is not performed, as the extensions will be imported in the new profile.
5. Test.

Note: You can return to your old profile at any given time by accessing "about:profiles" in the address bar

[qa_16/2026]

[brochignac]

So, I create a new profile and I haven't black screen with YT.
Just to clarify, I didn't have this problem two days ago, and I update Nightly every day.
Could it be a problem with the extensions (uBlock origin, Privacy Badger, Ghosthery...) ?
Thanks

[brochignac]

I think I've figured out the problem with YouTube: the "Ghostery" extension, and more specifically the “Never-Consent” option in the privacy settings, which is blocking videos from playing.

Disabling the “Never-Consent” option fixes the problem.

[brochignac]

I reported this issue on the "Ghostery" extension github website forwarded here
Unfortunately, disabling the “Never consent” option doesn't solve the problem, since the videos still freeze around 0:41/0:43.
I had to completely disable Gosthery.

[softvision-raul-bucata]

We appreciate your report, but this is not a Compatibility issue, it is related to Add-ons.

Note: Issues related to Add-ons can be reported here: https://bugzilla.mozilla.org/enter_bug.cgi?product=WebExtensions&component=General

For this project, we try to focus our effort on layouts, features or content that works as expected in one browser but not in another. Closing the issue as Non-compat.

[inv_16/2026]