Rated 5 out of 5 stars

Absolutely perfect! Gives me precise window sizes, which helps me when developing web pages for different platforms.

FYI: I see on the bottom-right corner the window size expressed in width x height (in my case, 1440x870 - would be 1440x900, but the mac menu bar steals that many pixels from the top). Click on that and a menu pops up.

And my favorite default size is maximized, so I just hit the plus sign. Should I need a new default, I know I can create one in there and just select it as needed.

If only I had this add-on about ten years ago, my life would've been MUCH easier.

This review is for a previous version of the add-on (1.0).