Video Converter is an add-on for the browser which helps you convert video files from one format to another. The add-on allows you to convert between MP4 and WebM, as well as a number of other formats. The process is very easy to do, you just need to drag the video file to the area where you want to start the conversion, then you can use the input file to specify the source format and the output file to specify the destination format. The program will then start to convert the video file. There are some sample commands available in the app UI which you can use to start working with this add-on.