[tor-bugs] #16775 [Tor Browser]: about:preferences is broken with security slider set to "High"

[Tor Bug Tracker & Wiki]

#16775: about:preferences is broken with security slider set to "High"
-------------------------+-------------------------------------------------
     Reporter:  gk       |      Owner:  tbb-team
         Type:  defect   |     Status:  needs_revision
     Priority:  normal   |  Milestone:
    Component:  Tor      |    Version:
  Browser                |   Keywords:  tbb-usability, tbb-5.0-regression,
   Resolution:           |  TorBrowserTeam201508R
Actual Points:           |  Parent ID:
       Points:           |
-------------------------+-------------------------------------------------
Changes (by gk):

 * status:  needs_review => needs_revision


Comment:

 Hm... `about:tor` is not loading for me on Linux anymore and I can't open
 the hamburger menu nor the browser console with Ctrl + Shift + J. After
 managing to get the menubar visible trying to open the browser console
 gives me
 {{{
 console.error:
   Message: TypeError: devtools.TargetFactory is undefined
   Stack:
     getTarget at resource://gre/modules/commonjs/toolkit/loader.js ->
 resource:///modules/devtools/webconsole/hudservice.js:219:7
 Handler.prototype.process at resource://gre/modules/Promise.jsm ->
 resource://gre/modules/Promise-backend.js:867:23
 this.PromiseWalker.walkerLoop at resource://gre/modules/Promise.jsm ->
 resource://gre/modules/Promise-backend.js:746:7
 this.PromiseWalker.scheduleWalkerLoop/<@resource://gre/modules/Promise.jsm
 -> resource://gre/modules/Promise-backend.js:688:37
 }}}
 Looking at my branch I built with your patch is the only one atop of the
 5.5 branch. Seems like we need some revision here.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16775#comment:9>
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