Coords is a useful tool that helps you finding out the mouse coordinates on the screen. You can draw points/shapes on the screen and discover their coordinates, or measure width and height of anything on the screen, and learn its dimension in terms of pixel. How to use it :

1. Add Coords as an extension to your browser
2. Click on Coords icon to activate/deactivate it
3. Move your mouse around to learn its position
4. Special functions:
   1. Click on the screen to draw a point
   2. Multiple points are joined to create shapes
   3. Click and drag to measure the shapes
5. Shortcut:
   1. h: hides point coordinates
   2. d: delete the last point
   3. Esc or c: cleans the screen
   4. p: hides the lines