[Bug 1905054]

[Pat Suwalski]

Although Firefox 84b2 from official binaries worked fine, Firefox 84.0
from official binaries (firefox-84.0.tar.bz2) does not.

Setting ```gfx.webrender.all``` as suggested above *does* work.

This appears to be a capability detection issue.

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https://bugs.launchpad.net/bugs/1905054

Title:
  Firefox 83 Breaks WebGL

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