What's your thinking behind how this works? What makes the 'after' sites more beautiful?
The increased padding on the Chromium site is great, but to me the HN 'after' looks quite a bit uglier than the 'before'.
Also the cpluscplus example. It throws structured data in a completely unreadable format and ads paddings to the navigation where they are surely not needed.
Thanks for feedback, I shouldn't have used "beautify" but "look good" kind of. Comments section is more readable IMHO http://i.imgur.com/Drb2nQ7.png
Shouldn't this be called "Bootstrap Me"? The beautifying is simply just inserting bootstap.css into the current tab. Cool idea, don't think it needs jQuery though and popup.css can be stripped down massively.
Yeah, it probably should be "Bootstrap me", but I did modified bootstrap.css to fit into this context. Also you are right with jQuery and popup.css.