I've been meaning to write a "Dark Souls"-style comment/annotation system for the web, via browser extensions, for some time now. What better use of the web is

I've been meaning to write a "Dark Souls"-style comment/annotation system for the web, via browser extensions, for some time now. What better use of the web is there than annotating a site like "goatse.cx" with the message "Be wary of but hole"? Genius is almost there now, but last I checked you had to open a new page (on genius.com) to annotate the page you're on, which ruins the immersion. And you can write freeform, which spoils the fun :-)