Default PDF reader can be replaced with a reader that works Rated 1 out of 5 stars
The built-in PDF viewer based on this plug-in is every bit as bad as these other reviewers have said. It displays files inaccurately, is wildly off at navigating to bookmarked pages when the bookmark is selected, etc. I'm astounded that in the latest updates to Firefox (v19), that Mozilla has made this completely substandard viewer the default.The good news: there's a way out. Mozilla has brief, easy, and helpful instructions for changing to a viewer that works. Adobe's plug-in, for example, causes PDFs to display as cleanly and accurately as they would on your desktop using Adobe's free Acrobat Reader.
For instructions, search Mozilla's website for the article "How to disable the built-in PDF viewer and use another viewer."