Examine source code of AutoSteamSpy

{
  "manifest_version": 2,
  "name": "AutoSteamSpy",
  "version": "1.1resigned1",
  "description": "Adds a floating Steamspy information bar to the steam store.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "background": {
    "scripts": [
      "AutoSteamspy-background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.store.steampowered.com/app/*"
      ],
      "js": [
        "AutoSteamSpy.js"
      ]
    }
  ],
  "permissions": [
    "*://steamspy.com/app/*",
    "webRequest",
    "contextMenus",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{18bfb81a-7526-405b-bb83-7d002e78eb1c}"
    }
  }
}