[tor-bugs] #22788 [Applications/Tor Browser]: Tor Browser rendering hangs when downloading large PDFs on higher security slider levels

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#22788: Tor Browser rendering hangs when downloading large PDFs on higher security
slider levels
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 Reporter:  teor                      |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  tbb-security-slider       |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by teor):

 I can confirm that this happens even if the tor process is no longer
 downloading PDFs.
 In fact, it still happens even after the tabs containing the PDFs have
 been closed!

 To reproduce:
 1. Go to
 http://www.mitsubishielectric.com.au/Air_Conditioning_User_Manuals.html
 2. Open a few of the PDFs (I tried about 10)
 3. Wait for some to load and start to render
 4. Close their tabs
 5. Try to open another site

 It took a long time for the tabs and window to close, and I couldn't open
 any other sites, even after tor had stopped downloading anything. I had to
 restart the browser.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22788#comment:6>
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