Investigate disabling disk caching of shaders

From #33534 (closed): Firefox 75 implemented more aggressive caching of shaders to disk. We should verify this does not happen in private browsing mode (or that the shaders being cached are not from web content).

https://bugzilla.mozilla.org/show_bug.cgi?id=1614679
"Cache shaders to disk even if they are compiled after the 10th frame"

Edited Sep 14, 2020 by Georg Koppen

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