I used another brand video downloader for years in Firefox, but it does not work on the Mac anymore. I've been trying other downloaders off and on over the last 2 years. Some were very complicated or just did work well. Wow, I'm so delighted about Video Downloader professional, it just works AND so super easy to use!! There was an error message that said it could not fine a particular file, BUT it still works wonderfully. Thank you for developing this plugin.