Examine source code of Huntlee Plugin

{
  "manifest_version": 2,
  "name": "Huntlee Plugin",
  "description": "Huntlee Plugin",
  "version": "2.5.5",
  "icons": {
    "16": "icon/16.png",
    "24": "icon/24.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "scripting",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Huntlee Plugin",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{63d04d6c-a33e-4281-94fa-c5d5824a7afc}"
    }
  }
}