This is my favourite extension!
I have used it for years and it never fails me!A basic eyedropper tool, that allows you to grab the code for any colour on your screen. Simply click the extension, click the colour on your screen, and instantly match that colour for anything you want. Want the exact blue from your school logo? Now you can!
I personally just use the hex code (The hashtag and following numbers/letters) but it does give you the RGB values also. This hex code can be copied and pasted straight any google app where you can select "custom colour".
It has a neat zoom function called "Fish Eye" which helps you choose the exact colour from an individual pixel.