@Seth yes, but leaving tags like that, at least for me in the open, it opens many other tags to use that are not actually Ubuntu related but more related to other SE sites. Not only that but if a SPDY, AJAX, HTML5.. or any of them are allowed, think of how many protocols, services Firefox has, or Chrome, Opera or any other browser.
My thinking is that they are better placed in an existing, more general tag like browser, server, webserver like mentioned above. I mean something general that covers small cases like those.