Very reliable, easy to use and fast. I like that the interface is easily accessed and easy to find and use, located below the video. Once download has started, I have found that you can navigate away from the page even closing the tab of the video without interrupting the download. As long as you have a Firefox browser page open your downloads will complete. Yes, it is possible to have many downloads in progress at one time. This is an awesome tool that I have relied on for a long time. Very dependable. My sincere thanks to the developer.