DownloadHelper icon doesn't move anymore, it doesn't recognise anymore a video that is playing Rated 5 out of 5 stars

The downloadhelper(v4.9.21) add-on for mozilla firefox (Mozilla Firefox 27.0.1 doesn't recognise anymore any video because the downloadhelper icon from the adress bar doesn't move anymore when a video (youtube, or from other site) is playing. Please, can you fix it?

This review is for a previous version of the add-on (