I've just set up a laptop with brand new Ubuntu 20.04 and visited Netflix in Firefox.
There was a yellow toaster underneath the address bar stating
You must enable DRM to play some audio or video on this page
So I clicked 'Enable DRM'. Then I saw "Firefox is installing components… please try again later" and after that went away I reloaded Netflix but it still would not play. When I play back video I get Netflix error F7355.
Then it points me to https://help.netflix.com where I can only find information on this error when I have trouble playing back on macOS or Windows. But I don't use those, I use Linux…
I understand that I can probably install Chrome which will Just Work – but I don't use Chrome. It seems like it could work but I'm missing something. What should I do to watch Netflix in Firefox on Linux on Ubuntu 20.04?