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NS_ERROR_NOT_AVAILABLE with unknown origin when loading some pages

I've noticed that for some pages, soon after page load I get two blank console errors:

NS_ERROR_NOT_AVAILABLE: 
NS_ERROR_NOT_AVAILABLE: 

I've noticed this for:

  • wikipedia.org.
  • torproject.org.
  • duckduckgo.com.

And it doesn't happen for

  • example.org.
  • example.com.
  • people.torproject.org/~henry/colors.html.
  • donate.torproject.org.

I'm not sure about the trigger. We should figure out what it is. Or what it might be breaking.

/cc @morgan @pierov @ma1

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