Examine source code of oneko

{
  "manifest_version": 2,
  "name": "oneko",
  "version": "1.3",
  "description": "Applies the oneko.js port of xneko/oneko to all pages.",
  "homepage_url": "https://github.com/SarahAlroe/oneko.js-firefox",
  "icons": {
    "32": "icons/oneko-32.png",
    "48": "icons/oneko-48.png",
    "96": "icons/oneko-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "oneko.js"
      ]
    }
  ],
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/oneko.svg",
    "default_title": "oneko",
    "default_popup": "popup/oneko_settings.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "web_accessible_resources": [
    "oneko.gif"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d835e0f8-dc63-4800-8036-80e25890fb41}"
    }
  }
}