Examine source code of Steam U2T

{
  "name": "__MSG_appName__",
  "version": "0.1.17",
  "manifest_version": 2,
  "description": "__MSG_appDescription__",
  "browser_specific_settings": {
    "gecko": {
      "id": "u2t@kemalersin.com"
    }
  },
  "icons": {
    "16": "assets/icon-16.png",
    "128": "assets/icon-128.png"
  },
  "default_locale": "tr",
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.steampowered.com/*",
        "*://*.steamcommunity.com/*"
      ],
      "js": [
        "scripts/globals.js",
        "scripts/helpers.js",
        "scripts/content-script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "alarms",
    "*://www.tcmb.gov.tr/*"
  ]
}