Bug 1846399 Comment 11 Edit History

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Original comment by
on 
(In reply to Nguyễn Hồng Quân from comment #7)
> More info, the "about:support" page makes whole Firefox freeze if the Facebook tab hangs, and is Ok if Facebook tab does not hang.

This seems to be because `about:support` attempts to initialize a WebGL context ([here](https://searchfox.org/mozilla-central/rev/d7a8eadc28298c31381119cbf25c8ba14b8712b3/toolkit/modules/Troubleshoot.sys.mjs#704), I think); and if the CanvasRenderer thread is stuck forever in a syscall, then that blocks forever.
Revision 1 by
on 
(In reply to Nguyễn Hồng Quân from comment #7)
> More info, the "about:support" page makes whole Firefox freeze if the Facebook tab hangs, and is Ok if Facebook tab does not hang.

This seems to be because `about:support` attempts to initialize a WebGL context ([here](https://searchfox.org/mozilla-central/rev/d7a8eadc28298c31381119cbf25c8ba14b8712b3/toolkit/modules/Troubleshoot.sys.mjs#704), I think); and if the CanvasRenderer thread is stuck forever in a syscall, then `about:support` gets stuck waiting at this point (just like other web content does).

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