Solved it for me by editing /etc/apparmor.d/usr.bin.firefox on XSE
(Debian- & Xubutnu 18.04 LTS-based distro):
# per-user firefox configuration
#...
owner @{HOME}/.{firefox,mozilla}/**/gmp-widevinecdm/*/lib*so m,
That solved the problem when using Mz Firefox 100.0 (64-bit) and widevine
4.10.2449.0
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https://bugs.launchpad.net/bugs/1777070
Title:
firefox plugin libwidevinecdm.so crashes due to apparmor denial
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