Examine source code of Wuxia Night

{
  "description": "Adds night mode to Wuxiaworld",
  "manifest_version": 2,
  "name": "Wuxia Night",
  "version": "1.1resigned1",
  "icons": {
    "48": "icons/border-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/border-48.png",
    "default_title": "Wuxia Night"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.wuxiaworld.com/*"
      ],
      "js": [
        "borderify.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{caa66ede-ae17-4488-8410-73e5e62331d0}"
    }
  }
}