Rated 4 out of 5 stars

I really like the idea behind this as an add-on but I'm not sure whether I'll keep it. If I could have it permanently on for my one website, I think it would be a little better.

The second best thing out there is this bookmarklet:
javascript:if(document.body.contentEditable=='true'){document.body.contentEditable='false';document.designMode='off';void%200}else{document.body.contentEditable='true';document.designMode='on';void%200}
but it makes the page editable, which is annoying.