Examine source code of Color Picker AZ

{
  "manifest_version": 2,
  "name": "Color Picker",
  "short_name": "Color Picker",
  "description": "Build a personalized color palette, select colors from webpages with the eyedropper, create color scales, and blend colors",
  "version": "2.0.3",
  "offline_enabled": true,
  "icons": {
    "16": "css/icons/16x16.png",
    "32": "css/icons/32x32.png",
    "36": "css/icons/36x36.png",
    "48": "css/icons/48x48.png",
    "64": "css/icons/64x64.png",
    "72": "css/icons/72x72.png",
    "96": "css/icons/96x96.png",
    "128": "css/icons/128x128.png",
    "144": "css/icons/144x144.png",
    "192": "css/icons/192x192.png",
    "512": "css/icons/512x512.png"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "scripting",
    "storage"
  ],
  "commands": {
    "pickColor": {
      "description": "Pick a color on the page"
    }
  },
  "browser_action": {
    "default_icon": "css/icons/144x144.png",
    "default_popup": "index.html",
    "default_title": "Color Picker"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dfdaa0d0-1b29-4e9d-8b25-7489ccefb449}"
    }
  }
}