Really nice and spares with what the old Scrapbook extension was providing to clean up webpages for print.

I love the "Isolate" function, really useful to trim the content to an article's text.

Maybe something that could be nice for people whith few HTML knowledge would be to show margins/paddings/width/heights in the floating tooltip - when defined in the upper DOM tree - and allow to change their values from there with fields or button.

I mean, I think this is one of the most current thing to deal with aside from removing ads and menu blocks, when you're aiming for the best print render.

Sorry, if I'm not clear. Maybe my idea is wrong or maybe it'll raise a completely different one.

Nice work and idea as it is now anyway, and thanks ! : )