Examine source code of TF2 Advanced Trader

{
  "name": "TF2 Advanced Trader",
  "description": "Helps with steam tradeoffers and backpack.",
  "version": "1.0.6",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "*://backpack.tf/classifieds*",
        "*://steamcommunity.com/tradeoffer/*",
        "*://steamcommunity.com/*/tradeoffers/sent/",
        "*://steamcommunity.com/id/*",
        "*://steamcommunity.com/profiles/*"
      ],
      "js": [
        "js/library/jquery-3.1.0.min.js",
        "js/library/bootstrap.min.js",
        "js/init.js",
        "js/backpack.js",
        "js/profile_page.js",
        "js/trade_offer.js",
        "js/content.js"
      ]
    }
  ],
  "icons": {
    "16": "images/backpack_fall_16.png",
    "128": "images/backpack_fall_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6e96b359-1052-4657-9db4-f2b1acfa6ac0}"
    }
  }
}