How to Install Sibelius' Scorch Plug-in for Firefox
NOTE: if you see the message at the top of the web page stating that Firefox prevented the site from opening a popup
Click the "Options" button and select "Allow popups for www.sibelius.com
If the download does not begin, you will need to refresh the page (ctrl + R) (click "OK" if needed to make the page refresh). You should now see a popup box to save the Scorch installation file
To run the program from here, you can simply click "Open" next to the "InstallScorch.exe" file OR go to your Desktop (or folder where you saved the installScorch.exe file) and double click the file to run it.
NOTE: You may need to restart Firefox or possibly reboot to begin viewing sheetmusic in your browser.