Description of problem: Firefox cannot read musicnotes format files e.g. from http://musicnotes.com Version-Release number of selected component (if applicable): firefox-28.0 How reproducible: Every time Steps to Reproduce: 1. Try to read a musicnotes sample file from http://www.musicnotes.com. I tried http://www.musicnotes.com/unsupported.asp?BadBrsr=true&ppn=MN0104316&mnuid=BG7FUH8ZRSJ74F629PXMJDQQCPNB6ZK81J437ZK8 Actual results: Firefox displays: "Your browser has been detected as: Firefox for Unknown Platform Upgrade Your Browser Since "Maria" is a Musicnotes Sheet Music File, we are unable to show it to you , as that would require software that is not currently available for your current web browser and/or operating system. If you're on Windows or Mac, you can download Firefox for a great experience on Musicnotes.com. We're Sorry Since "Maria" is a Musicnotes Sheet Music File, we are unable to show it to you , as that would require software that is not currently available for your current web browser. You can download Firefox for a great experience on Musicnotes.com. You can, however, save "Maria" by Leonard Bernstein for later by clicking the Add to Wishlist button below. Then return to Musicnotes.com on another Mac or PC and view the product by clicking on it in your wishlist (in the "My Account" area of the menu). Add to Wishlist " Expected results: Sheet music should be displayed. Additional info: Searching Tools/Add-ons for "musicnotes" did not suggest any suitable add-ons.
It's because the plug-in provided by the page is for Windows/MacOS only. So you need to use a different OS to access it.