[tbb-bugs] #32013 [Applications/Tor Browser]: Verify that new WebGL extensions in Firefox 68 ESR are disabled

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#32013: Verify that new WebGL extensions in Firefox 68 ESR are disabled
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  task                                 |         Status:  closed
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:  fixed
 Keywords:  ff68-esr, tbb-fingerprinting,        |  Actual Points:
  TorBrowserTeam201910, GeorgKoppen201910        |
Parent ID:                                       |         Points:  0.1
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by gk):

 * status:  new => closed
 * keywords:  ff68-esr, tbb-fingerprinting, TorBrowserTeam201910 =>
     ff68-esr, tbb-fingerprinting, TorBrowserTeam201910, GeorgKoppen201910
 * resolution:   => fixed


Comment:

 The extensions are disabled. They are instantiated in
 `WebGLContext::GetExtension()` only after checking whether they are
 supported. This happens in `WebGLContext::IsExtensionSupported()` which is
 first checking whether extensions are enabled in general and returning
 early if not
 {{{
 if (mDisableExtensions) return false;
 }}}
 `mDisableExtensions` gets set in `WebGLContext::InitAndValidateGL()`
 (`mDisableExtensions = gfxPrefs::WebGLDisableExtensions();`) which itself
 gets called early on in WebGLContext::CreateAndInitGL)`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32013#comment:1>
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