I wish this didn't use iframes, since so many applications set the X-Frame-Options header. That said, if I were using this against my own sites, I suppose I could just not serve that header.
Exactly - loaded it up with my site - all blank, thought about it for a second realized we disable Frame loading. That's becoming so common now, any tool using frames is really at a disadvantage.
Why do you disable loading in frames? Security?
Disabling embedding in frames is the default on Rails now, so that feature would have to be specifically disabled to use with this tool.