PHENOMENAL add-on. Use it a lot to extract clips of videos I can use in the classroom. The effort is very much appreciated!!
ADDED: It's now summer 2020 and with all the browser upgrades, I encountered an issue with downloading. I reported it and support jumped all over and fixed it immediately!! Couldn't be more happy...I'd recommend to anyone needing to download/save videos to get this add-on...AND DON'T BE CHEAP! show some appreciation for it as it's just a hobby to them...but a life saver for most of us!!! Thanks!!