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Video/audio issue

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Today, Firefox stopped playing audio on Facebook videos and won't play Netflix videos at all (Netflix error code: F7701-1003). Youtube works fine and has audio, but several other video sites I've tried have video but no audio. It was all working fine yesterday and I haven't changed any settings.

These websites work fine with both audio and sound on Microsoft Edge on the same laptop, so this is a problem exclusive to Firefox. OS is Windows 11 Home 23H2, Firefox is latest version (129.0.2)

Things I've tried: 1. Refresh Firefox settings 2. Download and install fresh copy of Firefox 3. Toggle DRM content in setting on/off - no difference no matter what is selected 4. Ensure that 'remember history' is selected 5. Check for Windows updates 6. Uninstall audio driver, restart and fresh install of audio driver 7. Ensure it's not in private mode 8. Turn off all extensions 9. Check volume mixer allows sound for Firefox 10. Clear the cache and cookies

I can't find any more suggestions on the internet, so any further suggestions welcome!

Today, Firefox stopped playing audio on Facebook videos and won't play Netflix videos at all (Netflix error code: F7701-1003). Youtube works fine and has audio, but several other video sites I've tried have video but no audio. It was all working fine yesterday and I haven't changed any settings. These websites work fine with both audio and sound on Microsoft Edge on the same laptop, so this is a problem exclusive to Firefox. OS is Windows 11 Home 23H2, Firefox is latest version (129.0.2) Things I've tried: 1. Refresh Firefox settings 2. Download and install fresh copy of Firefox 3. Toggle DRM content in setting on/off - no difference no matter what is selected 4. Ensure that 'remember history' is selected 5. Check for Windows updates 6. Uninstall audio driver, restart and fresh install of audio driver 7. Ensure it's not in private mode 8. Turn off all extensions 9. Check volume mixer allows sound for Firefox 10. Clear the cache and cookies I can't find any more suggestions on the internet, so any further suggestions welcome!

Modified by Mike_Bath

Chosen solution

Just installed the latest Windows 11 update (KB5041587) and this seems to have resolved the issue - video and audio all working fine now.

Many thanks for your suggestions.

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All Replies (12)

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Mike, did you try Troubleshoot Mode? (which tests a bit more than disabling all add-ons does) Or tested in a brand new profile? (which tests a bit more than refreshing does)

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TechHorse said

Mike, did you try Troubleshoot Mode? (which tests a bit more than disabling all add-ons does) Or tested in a brand new profile? (which tests a bit more than refreshing does)

I've just tried both of those - didn't solve the problem.

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Mike, did you try testing in a private window?

Did you try fully closing all Firefox windows inbetween the various troubleshooting steps, such as toggling settings, or testing in the clean new profile?

Modified by TechHorse

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TechHorse said

Mike, did you try testing in a private window? Did you try fully closing all Firefox windows inbetween the various troubleshooting steps, such as toggling settings, or testing in the clean new profile?

Yes, I've just tried all that - didn't solve the problem.

Additionally, I did a full uninstall and reinstalled an earlier version of Firefox (128), and that didn't solve the problem either. Have uninstalled that version and reinstalled the latest version, still have the same issue.

At this rate I might have to abandon Firefox for the time-being, which is a shame as I've never had a major problem with it before.

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Mike, sorry but I am running out of ideas!

The last thing I can think of is to uninstall Firefox, move all left-over install / application data folders on the hard drive to a temporary location, and then reinstall.

If that doesn't work, and if no-one else has any other ideas, then you may wish to consider filing a bug report at Bugzilla: https://bugzilla.mozilla.org/home

Modified by TechHorse

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I tried another uninstall/reinstall and moved all the related folders I could find. Still no luck.

Thanks for trying. I'll file a bug report, but in the meantime I guess it's time to go back to Edge.

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Mike, sorry that I couldn't help. If you do go on to file a bug report, then could I ask that you post a link to it here, for reference? Thanks.

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There have been a lot of reports recently of people having problems with video playback on sites such as Amazon Prime. So it might be worth using the Bugzilla search to see if any of the existing reports already describe the issue.

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Mike, some people with these media playback issues have been helped by making a change in about:config.

If you want to give this a try, then see Paul's post here: https://support.mozilla.org/en-US/questions/1457849

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Mike, Another thought, when a video starts without audio can you still nevertheless unmute it / raise its volume via its controls?

Also, what are your current autoplay settings?

Firefox can be set to autoblock audio while allowing video playback, so I am wondering if some setting has changed for some reason.

To check your autoplay settings you can do the following:

  1. go to the Tools menu (alt+T) and select settings.
  2. in the settings page, search for "Autoplay".
  3. find the Autoplay section in the results and press its settings button.

First you may wish to note down the existing settings before making any changes, so that you can restore them if the following doesn't make things work the way that you want. Also, remember to press "Save Changes" and you may need to restart Firefox for the changes to take effect.

If the "Default for all web sites" setting is set to something other than "Allow Audio and Video", then try changing it to this.

Or if there is a website exception listed with a setting that is something other than "Allow Audio and Video", then try either removing this exception, or changing it to this.

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Thanks, I just tried those last two suggestions and neither worked. Autoplay was set to 'Block Audio and Video' for all websites, but changing it, saving and restarting Firefox didn't solve the issue. No website exceptions are listed.

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Seçilmiş Həll

Just installed the latest Windows 11 update (KB5041587) and this seems to have resolved the issue - video and audio all working fine now.

Many thanks for your suggestions.

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Sual ver

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