I'm on mobile at the moment, but one I haven't seen mentioned is force allow right click. Super useful for websites that won't allow you to copy images or download a video off their site. Won't always work with the second one, but can if the web developers lazy.
Fair, with the right click add-on though, you can sometimes right click a vid and just save it. It'll override 2hatever they have right click doing (including disabling it)