There are so many ways to embed video and audio that I shouldn't be too upset that HTML Content Blocker doesn't catch them all. Would like to see support for IFRAME tags pointing to a user-supplied list of domains like youtube.com and vimeo.com. Or VIDEO tags that appear inside IFRAME tags. I may have also seen a video added as a DIV style="src:xxx".

The current UI seems a bit gaudy and I wish it could occupy less space, like a simple menu. It can also be difficult to see at a glance which options are enabled, as IMHO the icon shading is a bit too subtle. But these are fairly minor complaints.

HTML Content Blocker makes a valiant attempt and works most of the time.