Examine source code of Steam Game Covers

{
  "manifest_version": 2,
  "name": "Steam Game Covers",
  "version": "2.4.0",
  "author": "Dominik Hitschmann",
  "description": "This extension adds a 'Covers'-area to the Steam games page.",
  "icons": {
    "48": "img/icon.png"
  },
  "web_accessible_resources": [
    "img/*.png",
    "img/*.jpg"
  ],
  "permissions": [
    "storage",
    "webRequest",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://store.steampowered.com/app/*"
      ],
      "exclude_matches": [
        "*://*/*agecheck*"
      ],
      "css": [
        "css/steamgamecovers.css"
      ],
      "js": [
        "src/settings.js",
        "src/textPool.js",
        "src/steamScrollBarController.js",
        "src/steamDOM.js",
        "src/coversManager.js",
        "src/boot.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "src/installed/installed.js"
    ]
  },
  "options_ui": {
    "page": "src/settings/index.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a1c4741d-1872-4b56-916a-e2d8f3f89917}"
    }
  }
}