Firefox profile can't play netflix

I have a strange problem. I can’t play any Netflix videos since a few days.

netflix

I have tried clearing cookies, logging out, restarting the browser and the machine, nothing helped.

On a fresh profile, it works. So I know it’s a configuration issue. I was having this issue on my laptop, and now because of synced accounts, my desktop also has the same issue. Any thoughts how I can debug this? I would like to exhaust all options before I hit browser refresh.

Edit:

Since there’s some confusion, here’s a precise list of what I tried:

  • this is a working browser, that stopped working few days ago
  • cleared cookies
  • logged out
  • restarted browser/machine
  • disabled/re-enabled DRM
  • works in a fresh profile (started with firefox -ProfileManager)
  • problem propagated to other machine via sync (so can’t be cookies)

Edit:
I created a shortcut like this: firefox -P dedicated-profile https://www.netflix.com, to make this less annoying.

Have you turn on the drm contain.

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  1. Check whether DRM is on
  2. Update the browser to latest version
  3. Clear Cookies and Cache.

Any one of this should fix the issue.

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Do this to enable HEVC

For OpenH264 in Firefox I run:

sudo dnf config-manager --set-enabled fedora-cisco-openh264
sudo dnf install -y gstreamer1-plugin-openh264 mozilla-openh264

Afterwards you need to open Firefox, go to menu → Add-ons → Plugins and enable OpenH264 plugin. You can do a simple test whether your H.264 works in RTC on this page (check Require H.264 video).

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Thanks for the responses, but you are skipping over the details I have already provided!

  • cleared cookies
  • logged out
  • restarted browser/machine
  • this is a working browser, that stopped working few days ago
  • disabled/re-enabled DRM
  • works in a fresh profile (started with firefox -ProfileManager)
  • problem propagated to other machine via sync (so can’t be cookies)

I hope I have outlined everything clearly.

Hi,

Just found the official explanation for the error codes from Netflix.

Please try the suggestion from the official website, hope it help.

https://help.netflix.com/uk/node/100151

and from other resources:

https://appuals.com/streaming-error-f7121-1331-in-netflix/

Have you tried starting with all addons disabled?

If you’ve enabled VAAPI, you may also want to try disabling that.

If a new profile works, you could export your bookmarks to a safe place, delete the problematic profile, create a new profile, and import your bookmarks.

I found the problem, Netflix is breaking because I set privacy.resistFingerprinting to true. Setting it to false makes it work again. Since I have been using this setting for quite some years without an issue, I guess Netflix changed something on their end. I guess I’ll file a report on the Mozilla BZ, and see what happens.

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