Safari in El Capitan is not loading Quicktime plug-in
After installing El Capitan on my 2015 Macbook Pro, the websites I created using some Quicktime files, won't play the audio portions. On some of my sites Quicktime doesn't play either audio or video, and shows a "MISSING PLUG-IN" sign. If I access another computer running Yosemite, all my websites are just fine.