Examine source code of github-toc

{
  "manifest_version": 3,
  "name": "github-toc",
  "version": "0.2.0",
  "description": "Show the table of contents in github and make it possible to jump to headings.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "page_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "GitHub TOC",
    "default_popup": "popup/index.html",
    "show_matches": [
      "https://github.com/*"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{371ab72d-4e7e-490e-93bf-56dd58e7d2fe}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}