[Bug 1905054]

[Jgilbert]

After bug 1680595, it should be more clear to (power) users what they
can do to mitigate this.

Functionality here is, I think, working as intended now. Unfortunately
the specified behavior causes certain websites (which arguably may have
made poor choices) work worse for our users, whereas before things were
maybe slower than they could have been, but otherwise functional.

With that in mind, since we're now following
failIfMajorPerformanceCaveat spec properly, it's causing breakage. This
bug is tracking the user pain-point. In order to solve the user pain-
point, we might ditch failIfMajorPerformanceCaveat as accidentally-
user=hostile for the time being.

Two choices:
1. Call these bad websites, and try outreach/education
2. Re-evaluate the failIfMajorPerformanceCaveat mechanism entirely

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

Title:
  Firefox 83 Breaks WebGL

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