The major browsers have support for the <object/> tag. I want to incorporate a video player on my site to play .mkv video, but I cannot use most because the are based on flash, which can only play .flv & .f4v. That's why I'm switching to the <object/> tag But, if I wanted to incorporate a tag with the name of <mkvvideo/>, would a simple plugin associated with that tag be usable, or does the core programming of the firefox browser handle that? Thanks