[tbb-bugs] #22788 [Applications/Tor Browser]: Tor Browser rendering hangs when downloading large PDFs

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Jul 10 17:19:13 UTC 2017

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

 * status:  needs_information => new


 Replying to [comment:3 gk]:
 > Replying to [comment:2 teor]:
 > > Replying to [comment:1 cypherpunks]:
 > > > Isn't this expected since JIT is disabled in those higher security
 settings? Or should there be a whitelist for anything `pdf.js` (at least
 for the Medium security setting)?
 > >
 > > No, this seems to happen to *other* tabs only while the PDF is
 downloading, and not once it's loaded. I don't see why other tabs should
 be affected in 7.0.1 / multiprocess at all. But it seems worse than the
 6.0 series, not better.
 > With "downloading" do you mean getting the external helper app dialog
 and then downloading the file to disk or do you mean just loading the file
 into your browser over the Internet? Do the two scenarios behave
 differently for you?

 Yes. I only see the issue when loading the file into the embedded PDF

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22788#comment:4>
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