Examine source code of Daypack by Label Vier

{
  "manifest_version": 3,
  "name": "Daypack by Label Vier",
  "version": "2.1.0",
  "description": "All your Basecamp tools, always at hand in your daypack. Filter kanban boards, manage tasks, and stay organized.",
  "content_scripts": [
    {
      "matches": [
        "https://3.basecamp.com/*",
        "https://app.basecamp.com/*"
      ],
      "js": [
        "shared/content.js"
      ],
      "css": [
        "shared/content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "backpack@labelvier.nl",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}