According to Sibelius' website , http://avid.force.com/pkb/articles/en_US/compatibility/Sibelius-Scorch-plug-in-compatiblity it works with all latest versions of all major web browsers. Please update to Firefox 38.0.5 and then update scorch. Update Firefox to the latest release

You should never stay on such an old version of a web browser, it leaves you VERY at risk for security breaches that can steal your data.

Kate_ said

I have resisted the temptation to update the Firefox version I use (16), because previously it was not compatible with Scorch. Is it now compatible, so I can download music, and if required, listen to it. Thank you very much for your help, Kate

Thank you. I have happily updated - I had wanted to wait until after I'd finished my latest Open University module, just in case, and all is well. Many thanks for your help, Kate