Because the Netflix error message says to update widevine, I re-ran the update-widevine script, this time in a terminal, and noticed
Widevine (4.10.1196.0) is already installed and does not need to be updated
Redirecting "./libwidevinecdm.so" to "/home/spot/.local/lib/vivaldi/libwidevinecdm.so"
ln: cannot remove './libwidevinecdm.so': Permission denied
🤔
I reran the command with sudo ... and... after trying 1001 rational and irrational changes, I'm back to the default firejail profile, and Netflix works. 😑
Thanks for all the help.
Sincerely,
man facepalming
P.S. presumably this script runs during install since V played Netflix videos without firejail. Weird that it had to be re-run to enable widevine with firejail.
It is necessary to run sudo /opt/vivaldi/update-widevine again after each update.