[tbb-bugs] #22002 [Applications/Tor Browser]: Backport Mozilla's SVG-disabling patch

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#22002: Backport Mozilla's SVG-disabling patch
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 Reporter:  arthuredelstein           |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  tbb-security              |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by arthuredelstein):

 Replying to [comment:2 gk]:
 > Why do we want to backport that patch if things are missing and we have
 a working patch in our tree?

 We don't have to necessarily. Because the backport seemed to fix the
 crash, I was attempting to work with it, but found several missing edges
 cases. That's why I suggested in #21962 that we stick with the working
 patch, with Mark and Kathy's fixup.

 In the long run, given that we hope to reduce our maintenance by uplifting
 our SVG-disabling code, it seems to make sense that we would backport the
 Mozilla patch and add back the missing parts. Or we could ask Mozilla to
 work on that.

 FWIW, here is my WIP branch. I'm going to leave it at this stage until we
 decide on what to do.
 https://github.com/arthuredelstein/tor-browser/commits/22002_wip

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22002#comment:4>
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