I noticed you have a viewer plugin from that site. Could you check whether it is set to "click to play"? If so, you could try having it always activated. Open the Add-ons page using either: * Ctrl+Shift+a * orange Firefox button (or Tools menu) > Add-ons In the left column, click Plugins. Look for "Musicnotes Viewer" and if it says "Ask to Activate", change it to "Always Activate". Then return to the site and reload to see whether it works. ---- While you are on the Add-ons page... I noticed you have an extension named Media Watch that many users consider unwanted software or even a virus. On the Add-ons page, if you click Extensions in the left column, can you find Media Watch remove it? If the Remove button is missing, you probably need to remove some software using the Windows Control Panel, Uninstall a Program. Click the "Installed on" column heading to bring the most recent additions to the top. This typically will reveal that a bundle of (undisclosed) programs was installed along with something you actually wanted. Remove as much as possible here. Then you can supplement your regular security software with the scanners/cleaners listed in this support article: [[Troubleshoot Firefox issues caused by malware]].