Examine source code of commandrun

{
  "manifest_version": 2,
  "name": "commandrun",
  "author": "Berend De Schouwer",
  "homepage_url": "https://github.com/berenddeschouwer/commandrun",
  "version": "2.0",
  "description": "Allows running native commands.",
  "applications": {
    "gecko": {
      "id": "commandrun@banapple.de",
      "strict_min_version": "57.0"
    }
  },
  "permissions": [
    "nativeMessaging",
    "storage"
  ],
  "icons": {
    "48": "icons/commandrun-48.png",
    "96": "icons/commandrun-96.png"
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "background": {
    "scripts": [
      "lib/shared.js",
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "lib/shared.js",
        "content/content.js"
      ]
    }
  ]
}