Examine source code of Best Games Prices

{
  "manifest_version": 2,
  "name": "Best Games Prices",
  "version": "1.21",
  "description": "Get all games prices in your browser. Over 20 shops and keyshops from all over the world. Totally free, no ads! Buy smart!",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "*://store.steampowered.com/*",
    "*://*.gog.com/*",
    "*://*.epicgames.com/*",
    "*://store.ubi.com/*",
    "*://*.isthereanydeal.com/*",
    "*://*.allkeyshop.com/*",
    "*://*.wingamestore.com/*",
    "*://*.cdkeys.com/*",
    "*://gg.deals/*",
    "*://*.d3andre.com/*",
    "*://*.origin.com/*"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "img/*.png",
    "img/*.svg"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://store.steampowered.com/app/*",
        "*://www.gog.com/game/*",
        "*://www.epicgames.com/*",
        "*://store.ubi.com/*",
        "*://www.origin.com/*",
        "*://isthereanydeal.com/*",
        "*://www.allkeyshop.com/blog/*",
        "*://www.cdkeys.com/pc/*",
        "*://www.wingamestore.com/product/*"
      ],
      "js": [
        "game_price.js"
      ],
      "run_at": "document_end"
    }
  ]
}