Rated 4 out of 5 stars
Simple clicked the button to download & install ffmpeg.exe and it worked without a hitch.
The complaint I have is that I wasn't given a choice where ffmpeg was installed. It installed in my profile folder which means its only available to me and only in the one profile (I use a couple of profiles). I dislike apps which don't give a choice of install location, and as this add-on appears to allow the user to point the add-on at an existing ffmpeg install, I don't see why it won't allow the install location to be chosen, after all, the path to ffmpeg doesn't seem to be hardwired.
However, the install went fine and the install path was found automatically. Installation took less than 1 minute and the add-on was working.