Resizing to a "Mobile" resolution behaves erratically

Suggest to make pop out window as one option!

default window size feature with a double-click

Quick change to new size

Change the width of the browser, but not the height. (and draw a fold line for the height instead)

the browser window can't seem to resize to a phone properly anymore, I'm not sure if there is a way around this, maybe a combination of zooming and window resizing?

Leaving the Height blank could allow only width resizing. (don't change the browser's height)

All presets result in wrong window/viewport size. Retina problem?

Can we have retina icons please? and perhaps change the icons to the standard 'grey' chrome theme? Great extension though, love it!

Current version doesn't resize correctly