If you are using HTML 5 video tags, you might consider including OGG Theora file type in the source of your video files. Unfortunately, while both Safari and Google Chrome browsers can play Quicktime files without additional plug-ins, Firefox as of today decided to stay with an Open Source OGG Theora video files. We tested a couple of tools available on the market for Mac users. First one is Micro Video Converter (tested Version 3.0) is not recommended due to the flaw which renders the bit rate of a video file unacceptable. The online tool which is available at Online-Convert.com did a much better job and is recommended in this version. Micro Video Converter has a user friendly interface and hopefully they will fix this bug in the future release.