Examine source code of Reading Progress Bar Lite

{
  "manifest_version": 2,
  "name": "Reading Progress Bar Lite",
  "version": "1.0.0",
  "description": "Show a reading progress bar on the current webpage.",
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "reading-progress-bar-lite@local-addon.example",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_title": "Reading Progress Bar Lite",
    "default_popup": "popup.html"
  }
}