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