With all the talk recently about the exploits in Flash and Java, users are taking a closer look at their Firefox plugins. A couple plugins users may come across that look a little odd are the ones which provide HTML5 support in Firefox. Now remember, HTML5 Video is suppose to someday replace Adobe’s Flash (for the most part YouTube has been using HTML5 since early this year) and Microsoft’s Silverlight (no longer supported, but still used). These plugins are: Open H.264 Video Codec provided by Cisco Systems – shipped starting with Firefox 33 and allows playing of H.264 encoded content natively via…