Great.. one feature request though! Rated 4 out of 5 stars

This is a great addon for developers like me (along with the user agent switcher). It would be great to have configurable size presets (e.g. iPhone = 320x480, BlackBerry = 320x320, etc), and to also keep the size until turned off (e.g. when I click a link it goes back to full size). Ideally the user agent would switch at the same time though.. hmm..