Examine source code of Opsgenie Notifier

{
  "name": "__MSG_extName__",
  "short_name": "OG Notifier",
  "description": "__MSG_extDescription__",
  "homepage_url": "https://github.com/jkroepke/opsgenie-browser-extension",
  "version": "2.5.0",
  "manifest_version": 3,
  "default_locale": "en",
  "icons": {
    "16": "/images/16x16.png",
    "32": "/images/32x32.png",
    "48": "/images/48x48.png",
    "128": "/images/128x128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_title": "__MSG_extName__",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/images/16x16.png",
      "32": "/images/32x32.png",
      "48": "/images/48x48.png",
      "128": "/images/128x128.png"
    }
  },
  "content_security_policy": {
    "extension_pages": "default-src 'none'; script-src 'self'; style-src 'self'; connect-src https://api.opsgenie.com https://api.eu.opsgenie.com;"
  },
  "options_ui": {
    "open_in_tab": false,
    "page": "options.html"
  },
  "host_permissions": [
    "https://api.opsgenie.com/*",
    "https://api.eu.opsgenie.com/*"
  ],
  "permissions": [
    "storage",
    "alarms"
  ],
  "optional_permissions": [
    "notifications"
  ],
  "developer": {
    "name": "Jan-Otto Kröpke",
    "url": "https://github.com/jkroepke"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "opsgenie-notifier@jkroepke.de",
      "strict_min_version": "115.0"
    }
  }
}