Firefox profile causes widevine DRM to crash

[Zero]

Steps to reproduce the issue:
===============================
1) Enable digital rights management support in FireFox (Preferences -> General)
2) sudo aa-enforce /etc/apparmor.d/usr.bin.firefox
3) Navigate to a site which has protected content (I tested this using crunchyroll.com)

FireFox should display a yellow bar at the top letting you know Widevine has crashed.

Workaround:
===============================
I corrected this problem by adding the following line to usr.bin.firefox:

owner /home/*/.mozilla/firefox/rutsti3o.default-release/gmp-widevinecdm/4.10.1440.19/libwidevinecdm.so m,

Conclusion:
===============================
Maybe the default FireFox profile can be updated in a way that allows it to play nice with Widevine in the future.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Tim (tim8816)]

Affects the following version of widevine, too. It's not updated yet in Widevine.

Widevine Content Decryption Module
Version
4.10.1582.2
Zuletzt aktualisiert
25. April 2020

[baptx (b4ptx)]

Since this issue is marked as duplicate of bug #1777070, let's continue the discussion there: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1777070
I added a new comment.