Examine source code of Hermes

{
  "name": "Hermes",
  "description": "Convert currency reliable as sun rise",
  "version": "1.0.3",
  "author": "Dmytro Pustovit",
  "manifest_version": 2,
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png",
    "256": "icons/256.png",
    "512": "icons/512.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "contextMenus"
  ],
  "sidebar_action": {
    "default_title": "Hermes Converter",
    "default_panel": "sidebar.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f597ac1d-8bad-5110-82f9-bcd6b655c47b}"
    }
  }
}