Examine source code of Nano shortcuts

{
  "manifest_version": 2,
  "name": "Nano shortcuts",
  "version": "1.1",
  "description": "Enable the shortcuts displayed on nano-editor.org",
  "homepage_url": "https://github.com/frommMoritz/nano-shortcuts/",
  "content_scripts": [
    {
      "matches": [
        "*://*.nano-editor.org/*"
      ],
      "js": [
        "shortcuts.js",
        "nano-shortcuts.js"
      ]
    }
  ],
  "icons": {
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png",
    "256": "icons/icon-256.png",
    "512": "icons/icon-512.png"
  },
  "applications": {
    "gecko": {
      "id": "git@moritz-fromm.de"
    }
  }
}