Speaking of extensions, you will be glad to learn that Torch browser supports the same extensions that you use in Google Chrome.
No third-party tools or extensions are required. Aside from YouTube, the included media grabber allows you to retrieve audio and video files from a large number of websites by simply clicking a button. Torch browser’s media grabber, however, works fine with YouTube videos.
A lot of YouTube video downloading tools stopped working after Google made changes to YouTube’s code last year.