Browsers: How to Make Firefox Open PDFs
TLDR: In Firefox: Enter "about:config" into the address bar. Click past the warranty warning. Search for the preference "pdfjs.disabled" and make sure it's set to "false". Enter "about:preferences#applications" into the address bar. Search for the Content Type of either "PDF", "Portal Document File (PDF)", or "Adobe Acrobat Document" and set the Action value to "Preview in Firefox". The Setting... This week at work, we got a couple of customer complaints about Firefox not opening PDF's on one of our web pages. The way we had the PDF open up was using an <iframe> element and setting the URL of the iframe to the source of the PDF. It worked fine in Chrome and IE11 (which are the other two major browsers we support) so what happened? I'd say the perfect storm. The Leaking Boat: Firefox Ending Support for NPAPI Plugins Back in October 2015, the Mozilla Firefox team annou...