Hello! Some time ago, I updated my Swedish Windows 10 Pro N 64-bit to version 1703 (the 'July update' I have understood it's commonly referred to as?). After updating, Firefox prompted me to install the new version of Media Feature Pack, linked in this article: https://support.mozilla.org/en-US/kb/fix-video-audio-problems-firefox-windows As I am on a 64-bit system, I am only able to install the 64-bit version of the MFP. Either way, after installing, I rebooted the computer. After the reboot, Firefox still prompted me to install the MFP, which I found odd. I downloaded it again, but when started the installation program it said I already had installed MFP. So, I googled a bit and found this article: https://support.mozilla.org/en-US/kb/windows-media-or-other-plugins-stopped-working - however, I apparently had already followed those steps earlier as the 'plugins.load_appdir_plugins' field was already modified and set to 'true'. I couldn't find any other articles related to the issue, and I can't find any newer threads regarding this issue. Troubleshooting information is available below, and I can provide more details as needed. Anyone has any idea what could be the cause of this?