I made this last year for fun while working on a responsive project, partly to continue learning about extensions and also to do some non jQuery JavaScript, to help wean me off using it unnescessarily in projects.<p>Code is on github too, <a href="https://github.com/grahamlicence/chrome-resize" rel="nofollow">https://github.com/grahamlicence/chrome-resize</a> if you want a starting point to make your own.<p>In light of the "Window resizer" extension trickery I'd recommend making your own one because it's fun and you can make it do exactly what you need.