Examine source code of Color Picker

{
  "name": "Color Picker",
  "description": "A simple color picker extension. Easily pick any color on the screen, view history of picked colors, and copy or clear them with a single click.",
  "version": "1.0",
  "manifest_version": 2,
  "action": {
    "default_popup": "index.html"
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{35f0352b-6f21-49e8-a2a8-90cc70420a70}"
    }
  }
}