• I was dropping firefox for ohter browsers as it lacked ability to display PDFs online

  • after a loing wait, I found out pdf.js :

     pdf.js is an HTML5 technology experiment that explores building a faithful and efficient Portable Document Format (PDF) renderer without native code assistance.
    
    pdf.js is community-driven and supported by Mozilla Labs. Our goal is to create a general-purpose, web standards-based platform for parsing and rendering PDFs, and eventually release a PDF reader extension powered by pdf.js. Integration with Firefox is a possibility if the experiment proves successful.
    
  • check out: https://github.com/mozilla/pdf.js/

  • install: https://addons.mozilla.org/en-US/firefox/addon/pdfjs/