Examine source code of Reading Bookmark Cleaner

{
  "manifest_version": 2,
  "name": "Reading Bookmark Cleaner",
  "version": "1.0.12",
  "description": "Review and clean older chapter bookmarks from a selected Firefox bookmark folder.",
  "permissions": [
    "bookmarks",
    "storage"
  ],
  "browser_action": {
    "default_title": "Reading Bookmark Cleaner",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "reading-bookmark-cleaner@local",
      "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",
    "128": "icons/icon-128.png"
  }
}