What is a good program (or browser plug-in) that allows for easy downloading?

I had a plug-in for Chrome that allowed super easy leeching of just about anything

(YouTube, Pornhub, etc....), Rightclick, Save As...

But it recently just stopped working on almost everything

(still works on XVideos, but for how much long, I don't know...)

If it's a plug-in, I prefer Firefox (although I use Chrome also)