Examine source code of Tags for Google Calendar™

{
  "name": "Tags for Google Calendar™",
  "version": "1.1.0",
  "manifest_version": 3,
  "description": "A little visual addon that adds special markup to tags and question marks in event names.",
  "homepage_url": "http://www.soimon.com/",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "default_locale": "en",
  "host_permissions": [
    "https://calendar.google.com/*",
    "http://calendar.google.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://calendar.google.com/*",
        "http://calendar.google.com/*"
      ],
      "all_frames": true,
      "js": [
        "dist/index.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5f824c5f-b9c9-4d46-b602-021ea050b850}"
    }
  }
}