Examine source code of CAHExtension

{
  "description": "Custom card deck management for Cards Agains Humanity",
  "manifest_version": 2,
  "name": "CAHExtension",
  "version": "0.3resigned1",
  "icons": {
    "48": "icons/border-48.png"
  },
  "browser_action": {
    "default_icon": "icons/border-48.png",
    "default_title": "Manage CAH presets",
    "default_popup": "popup/presetList.html"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.pretendyoure.xyz/zy/game.jsp*"
      ],
      "js": [
        "StorageHelper.js",
        "helpers.js",
        "UIAddition.js",
        "cards.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a4fe0019-4338-46a6-bc89-9116a05df38b}"
    }
  }
}