Simple Window Resizer v2.0
You might like this add-on if you frequently switch between the display of your laptop and external screens and do not like browsing in fullscreen. In one click it moves your window to a pre-defined position and resizes it to leave a configurable space around (I personally like to see my instant messenger window all the time on the right).
Recommended values for top, left and bottom margins in Windows 10 are -1, -6 and 34 px, respectively.
Any feature request welcome! :-)