Examine source code of Color Picker v3

{
  "manifest_version": 2,
  "name": "Color Picker",
  "version": "1.0",
  "description": "Easily pick colors and get their HEX and RGB values.",
  "icons": {
    "48": "icons/color-picker-icon-48.png"
  },
  "permissions": [],
  "browser_action": {
    "default_icon": "icons/color-picker-icon-48.png",
    "default_popup": "color-picker-popup.html",
    "default_title": "Color Picker"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c3dc629f-1a2d-4386-9217-43d07849f319}"
    }
  }
}