It's probably a plugin that you can disable. That's how they do it in Chrome.
------- Brian Weeden Secure World Foundation +1 202 683-8534 On Mar 5, 2013, at 17:11, Christopher Fisk <christopher.f...@thefisks.org> wrote: > Security issues in adobe and frankly the annoyance of having to use another > program for PDF's is why it was added. > > http://dottech.org/97910/firefox-how-to-turn-off-change-built-in-pdf-reader-viewer-in-firefox-19-and-higher/ > > > On Tue, Mar 5, 2013 at 3:07 PM, Thane Sherrington < > th...@computerconnectionltd.com> wrote: > >> Does anyone know how to turn off Firefox's new PDF viewer? I use Sumatra >> PDF, and I don't want Firefox to open PDFs in it's own viewer (I'm not sure >> how this was a required feature). I've gone into options and applications, >> and set it to ask, but that doesn't change it. Any ideas? >> >> T >> >> >>