Extension does not work

[felix920506]

After installing the extension and blocking VP8 and AV1, Dolby browser codec test still shows AV1 and VP8 as available

Test Link: http://ott.dolby.com/codec_test/index.html

Settings in extension

Codec test result (same regardless of settings of extension)

Force refreshing does not solve the problem

System:
Firefox 133.0 on macOS 14.5
macbook Pro 14 inch 2021 (M1 Pro)