Examine source code of Color Picker Tool

{
  "manifest_version": 2,
  "name": "Color-Picker",
  "version": "0.1",
  "description": "Grab a color from a webpage",
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "icons": {
    "48": "icons/picker-48.png",
    "96": "icons/picker-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{957cc8aa-2db6-40c1-b3a5-720cce0f97f0}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/picker-48.png",
      "96": "icons/picker-96.png"
    },
    "default_title": "Activate Color Picker",
    "default_popup": "popup.html"
  }
}