Examine source code of Cookie Manager

{
  "manifest_version": 2,
  "name": "Cookie Manager",
  "version": "1.0",
  "description": "Manage and edit cookies for any website.",
  "permissions": [
    "cookies",
    "activeTab",
    "http://*/*",
    "https://*/*"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Cookie Manager",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icon.png",
    "96": "icon@2x.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{640c7ac0-ac0c-44dc-8a60-93fe3dd2a0e6}"
    }
  }
}