But to get it to work I had a few issues.
Firstly, if a Flash Plugin is installed, it wouldn't work.
Only after I uninstalled Flash Player and added a blocking rule of: *.swf to my adblocker to block all flash files from attempting to load, this addon then started working and boy does it works well!
While some videos on some sites still wont play with this add-on, a LOT more do play than before.
Five stars worthy? Oh yes.