I made a browser extension that let you upscale and enhance videos from your browser in real-time: NexVid

You can apply different upscaling profiles from best performance to best quality, apply some filters to play with contrast, saturation and brightness of the video and also apply shaders directly to the video (CRT filter, VHS lines and many more). All of this completely free, in real-time and directly in your browser. I mainly tried it on Youtube and Twitch but it should work on most websites providing videos. I suggest to use it for anime and cartoon for best results. The extension is called ...