The user interface you are accessing requires Firefox to render

 

Firefox is a free, open source, cross-platform, graphical web browser developed by the Mozilla Corporation and hundreds of volunteers. Firefox features tabbed browsing, pop-up blocking, download manager, live bookmarks and a huge resource of extensions, themes and plugins, as well as enhanced user privacy and security.

Please note that you are not forced to use Firefox as your default browser. MediaCoder will detect and launch Firefox to display its HTML-based user interfaces even if it's not the default browser. If you really don't like to install Firefox, see here for alternatives.