Examine source code of keep

{
  "action" : {
    "default_popup" : "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "keep@jaaccc.me"
    }
  },
  "description" : "save and group tabs.",
  "icons" : {
    "16" : "images/icon-16.png",
    "32" : "images/icon-32.png",
    "48" : "images/icon-48.png",
    "128" : "images/icon-128.png"
  },
  "manifest_version" : 3 ,
  "name" : "keep",
  "permissions" : [
    "storage" ,
    "tabs" 
  ],
  "version" : "1.1.0"
}