Here's a Chrome extension to read the browser's width and/or set it to a new width.
This came about because all of the extensions to change browser size that are in the Chrome web store try to emulate device or screen sizes.
At Brolik, we just wanted one that changed browser width, because that's how we test responsive websites. Move the right side of the browser left and right.
I think it's a cool example of designing for how humans actually act instead of how we'd expect them to act.