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

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#15163: Some systems may cause external aps 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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Description changed by mikeperry:

Old description:

> A Linux user just showed me an old TBB that they had upgraded since 4.0
> to 4.0.4 using the updater, and this TBB had extra entries for PDF in the
> browser Preferences->Applications window. This caused Tor Browser to try
> to launch an external application to handle PDFs. The Torbutton external
> application warning was displayed, and if accepted, a system PDF viewer
> would be used instead of pdf.js.
>
> When they installed a fresh TBB on the same system in a new directory, it
> did not have these entries, and used pdf.js.
>
> It's not clear if it was updating that caused this issue, or if something
> else changed on their system.

New description:

 A Linux user just showed me an old TBB that they had upgraded since 4.0 to
 4.0.4 using the updater, and this TBB had extra entries for PDF in the
 browser Preferences->Applications window. This caused Tor Browser to try
 to launch an external application to handle PDFs. The Torbutton external
 application warning was displayed, and if accepted, a system PDF viewer
 would be used instead of pdf.js.

 When they installed a fresh TBB on the same system in a new directory, it
 did not have these entries, and used pdf.js.

 It's not clear if it was updating that caused this issue, or if something
 else previously changed TBB on their system while it was running.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15163#comment:1>
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