I find Video Downloadhelper almost invaluable in capturing videos from websites (and thus allowing me to watch then in my own time or on other devices, rather than be stuck in front of a desk bound screen).

Sadly, it doesn't download to Firefox on iOS and sticks an ugly visible QR code in the left hand corner of the video unless you actually buy the add-on. I would have done this long ago IF they (VD) had advertised this fact UP-FRONT before installation/use.

Right now this behavior just annoys me and makes me more selective about which videos I do download. It's a shame (and a request) to provide a function (for the purchased version) which would retroactively remove the QR code from captured videos. In fact on 'off-days' I'm sorely tempted to put aside some time to write my own VD add-on just because of this.

Otherwise, it has a great set of features, options and conversions that are truly useful.

Cheers