[tbb-bugs] #15163 [Tor Browser]: Some systems may cause external apps to override pdf.js?

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#15163: Some systems may cause external apps to override pdf.js?
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     Reporter:  mikeperry    |      Owner:  tbb-team
         Type:  enhancement  |     Status:  new
     Priority:  normal       |  Milestone:
    Component:  Tor Browser  |    Version:
   Resolution:               |   Keywords:  tbb-usability
Actual Points:               |  Parent ID:
       Points:               |
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Comment (by mcs):

 The Applications preferences are stored in
 TorBrowser/Data/Browser/profile.default/mimeTypes.rdf.  I am not sure how
 that file could have gained an extra entry for application/pdf.  I wonder
 if there is code inside the browser somewhere that is triggered when users
 upgrade from a Firefox that does not include pdf.js to one that does
 includes it (and what happens if that code is accidentally run a second
 time)?  But I have not looked for such code.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15163#comment:4>
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