[tbb-bugs] #27261 [Applications/Tor Browser]: Tor Browser 8.0a9/10 gets stuck in an endless reload cycle

Tor Bug Tracker & Wiki blackhole at torproject.org
Wed Aug 22 20:37:48 UTC 2018

#27261: Tor Browser 8.0a9/10 gets stuck in an endless reload cycle
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  Very High                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  TorBrowserTeam201808, ff60-esr,      |  Actual Points:
  noscript                                       |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:

Comment (by ma1):

 Replying to [comment:13 gk]:
 > So, my current theory is that there is an underlying bug that is causing
 to break NoScript (and the HTTPS-E and potentially other (Web)Extensions)
 in a way that the reload cycle happens.

 This is a pretty good working theory: in facts, one of the thing NoScript
 does to ensure other extensions don't interfere accidentally with the CSP
 it injects in webRequest.onHeadersReceived in the parent process, is
 checking whether scripts are actually blocked at a later stage (in the
 child process), and if they aren't, it triggers a page reload after trying
 its best to ensure NoScript has the final word on HTTP headers next time.

 Therefore if something consistently messes with NoScript's ability to
 block scripts, and especially strips off the CSP headers of a page in a
 way that causes pages' JavaScript to bypass NoScript's restriction, that
 would likely cause a reload loop.

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27261#comment:14>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

More information about the tbb-bugs mailing list