Examine source code of MythicalMap

{
  "manifest_version": 3,
  "name": "MythicalMap",
  "version": "0.0.1",
  "description": "Generates a document-map of headings/sections, flags heading-level errors, and provides an HTML5 Outliner view.",
  "browser_specific_settings": {
    "gecko": {
      "id": "arr2019@outbook",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "sidebar_action": {
    "default_title": "MythicalMap",
    "default_panel": "sidebar.html",
    "default_icon": {
      "16": "icons/icon-16-sidebar.png",
      "32": "icons/icon-32-sidebar.png"
    }
  },
  "permissions": [
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "vendor/HTMLOutliner.js",
        "content-script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "vendor/HTMLOutliner.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}