Awesome add-on Rated 5 out of 5 stars
I love this add-on! It does work with FF19, to a point. It still downloads videos, it just doesn't show the video in the Downloads window nor on the Download Statusbar add-on download manager.
I still find my videos in the destination folder in Windows Explorer on WinXP. I just can't find out about the status of the downloading video: size, time remaining, etc.
Can you give a try with this beta version http://www.downloadhelper.net/install-beta.php?version=4.9.14b1 and report if it fixes the problem in the bugzilla interface http://bugzilla.downloadhelper.net:8080/show_bug.cgi?id=496