Forget it. It used to be decent and now they ruin your video with an ad link to their program! Absurd. There are firefox add-ons that are not this intrusive and do not require $30.00US to remove. Look elsewhere.
Just a heads up, this AddOn charges you $28.50 USD to remove a QR Watermark from the videos you download. It may work well, but the watermark makes it useless for me. I guess I'm sticking with full screen capturing in OBS, works really well and you get the same high resolution as the playback.