[bholley]

See https://bugzilla.mozilla.org/show_bug.cgi?id=1511726

Assuming you're on non-Windows, the message is expected and not indicative of a problem. I've pushed a patch to disable it going forward. Sorry for the noise.

[shmerl]

Thanks for the pointer. May be still display something but like "shader cache is not used" so it will be clear that the feature isn't utilized yet.