Whenever I go to YouTube, there is a green download button, YouTube blocks whole page goes dark. No issue using Brave or other browsers. I use when trying to download a clip I'd like to keep watching to learn, without all the wasted overpriced data I disable the extensions apps I think relevant, then refresh, no change, disable popup blockers like Ghostery & Adblock plus, refresh, still no change. Showed an example. Using Windows 10 pro on Desktop, 64bit, internet is fibre optic as fast for rural, 16Gb RAM, 7TB Separate HDD's. Reasonably comfortable with pc use Been present for last couple of weeks, use other bought programs to download but unable to view prior on Mozilla, but works fine on other browsers