Examine source code of NoteKeeper

{
  "manifest_version": 2,
  "name": "NoteKeeper",
  "version": "2.1.0",
  "description": "NoteKeeper transforms your new tab into a minimalist, auto-saving text editor.",
  "author": "semanticdata",
  "browser_specific_settings": {
    "gecko": {
      "id": "newtab-notes@semanticdata",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "32": "icon.svg",
    "48": "icon.svg",
    "64": "icon.svg",
    "96": "icon.svg",
    "128": "icon.svg"
  },
  "browser_action": {
    "default_title": "NoteKeeper",
    "default_icon": {
      "32": "icon.svg",
      "48": "icon.svg",
      "64": "icon.svg",
      "96": "icon.svg",
      "128": "icon.svg"
    }
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  }
}