Netflix will no longer play movies after Firefox Update to 89.0. I am running Ubuntu Mate 18.04 on an HP 32 bit Probook
Solution 1:
32 bit Linux is no longer supported by the current Widevine 4.10.2209.1 version and older Widevine versions can no longer get a valid license.
https://support.mozilla.org/en-US/kb/enable-drm
Solution 2:
I would recommend to install Firefox ESR from the PPA:
sudo add-apt-repository ppa:mozillateam/ppa
sudo apt-get update
sudo apt-get install firefox-esr
and then launch it using firefox-esr command to test.