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"
  }
}