Examine source code of Dolar Lira

{
  "name": "Dolar Lira",
  "description": "Tracks US Dollars to Turkish Liras exchange rate",
  "version": "2019.0.1",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Dolar Lira",
    "default_icon": "./img/dolarLira_16.png"
  },
  "permissions": [
    "declarativeContent",
    "storage"
  ],
  "icons": {
    "16": "./img/dolarLira_16.png",
    "32": "./img/dolarLira_32.png",
    "64": "./img/dolarLira_64.png",
    "128": "./img/dolarLira_128.png",
    "256": "./img/dolarLira_256.png",
    "512": "./img/dolarLira_512.png"
  },
  "background": {
    "scripts": [
      "./js/background.js"
    ]
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+F",
        "mac": "MacCtrl+Shift+F"
      },
      "description": "Tracks US Dollar- Turkish Liras exchange rate"
    }
  }
}