Get the extension here:

Once you've added the entension to Chrome, right click on any image on a webpage and click 'Palette' for Chrome. You'll then be able to tell Palette to create for you a custom palette using 16, 24, 32 or a custom amount of colours. That's it! Palette will extract colours from the image you have provided and generate your palette immediately.
You'll be taken to a new page, showing all of the colors in your new palette, along with each one's RGB and HEX (HTML) code.

That's it for now. I'll be back with more great tips, soon!