Examine source code of Nightscout Extension

{
  "name": "Nightscout Extension",
  "version": "1.0.0",
  "description": "A Firefox extension that adds a convenient way to check blood sugar data from Nightscout in your browser.",
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "permissions": [
    "storage",
    "https://*.fly.dev/",
    "notifications"
  ],
  "optional_permissions": [
    "https://*/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/nightscout16.png",
      "32": "images/nightscout32.png",
      "48": "images/nightscout48.png",
      "128": "images/nightscout128.png"
    }
  },
  "icons": {
    "16": "images/nightscout16.png",
    "32": "images/nightscout32.png",
    "48": "images/nightscout48.png",
    "128": "images/nightscout128.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{153e6cc8-56dd-4c10-b216-666616719afa}"
    }
  }
}