1886323 - Widevine is listed twice in about:addons after unchecking the "Play DRM-controlled content" setting in another tab

Status: NEW

(Core :: Audio/Video: GMP, defect)

Description

[Chris Peterson [:cpeterson]]

Attachment: about-addons_screenshot.png

Andrew, I bisected this regression to this pushlog where you enabled Widevine L1 CDM in bug 1865746. I realize that bug just flipped a pref, so the actual code regression landed in an earlier changeset. This bug seems harmless (Widevine is temporarily listed twice in about:addons, which few users will ever see), but I want to make sure this bug is a side effect of a deeper regression in CDM initialization.

https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=b374469160e96d367aea7903f41f46e35ea4367e&tochange=9f7a6c8fac1a3a794e57edd09140ec7437233948

Steps to reproduce

1. Open about:addons.
2. Click "Plugins".
3. See that "Widevine Content Decryption Module provided by Google Inc." is listed.
4. In a new tab, open about:preferences.
5. Search the settings for "Play DRM-controlled content".
6. Uncheck "Play DRM-controlled content". This will disable and then uninstall the Widevine CDM.
7. Switch back to the about:addons tab.

Expected result

Widevine should only be listed at most once in about:addons, regardless of whether it is enabled or disabled.

Actual result

Widevine is listed (disabled) twice. See the attached screenshot.

If you reload about:addons, Widevine is no longer listed. That is expected because unchecking "Play DRM-controlled content" uninstalls the CDM and it must be download again before Widevine content can be played.

Comment 1

[Chris Peterson [:cpeterson]]

I can reproduce this bug on Windows 11 and macOS 14.4.

Comment 2

[Donal Meehan [:dmeehan]]

Marking 124 and 125 as disabled.
media.gmp-widevinecdm-l1.visible and media.gmp-widevinecdm-l1.enabled are still nightly only for now

Comment 3

[Jim Mathies [:jimm]]

This is the level 1 cdm. We just haven't updated the text.

Comment 4

[BugBot [:suhaib / :marco/ :calixte]]

:aosmond, since you are the author of the regressor, bug 1865746, could you take a look?

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