From Mike Medley:
Facebook Video for Firefox allows Facebook users to share personal videos with their friends outside of Facebook. Facebook Video for Firefox is a Greasemonkey Facebook video script. The download, convert video, and customize code links are added to Facebook video pages in an unobtrusive way. Also a box containing the embed code for the video is provided, along with a public link to the video at the bottom of the page. The download link is a direct link to the video file. The convert link leads to Zamzar.com where a user can convert the video to several formats and receive a link in an email to download the converted version. The customize code link opens a dialog to change the resolution of the embed code. Once the user selects "Update" the embed code in the box is changed to reflect the users preferences and the video will also be replaced so that they can view the immediate result of their changes. Links will appear on video pages to the right of the video.