Examine source code of Grid Grabber

{
  "manifest_version" : 2 ,
  "name" : "Grid Grabber",
  "version" : "4.2.4",
  "description" : "Grabs tables from web pages and hands them back as clean, spreadsheet-ready text you can copy or save.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{12266c2f-48c0-4b38-9de1-4bed8cfc5591}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons" : {
    "32" : "assets/icon-32.png",
    "48" : "assets/icon-48.png",
    "64" : "assets/icon-64.png",
    "96" : "assets/icon-96.png",
    "128" : "assets/icon-128.png"
  },
  "browser_action" : {
    "default_title" : "Grid Grabber",
    "default_popup" : "scripts/popup.html",
    "default_icon" : {
      "32" : "assets/icon-32.png",
      "48" : "assets/icon-48.png",
      "64" : "assets/icon-64.png",
      "96" : "assets/icon-96.png",
      "128" : "assets/icon-128.png"
    }
  },
  "permissions" : [
    "storage" ,
    "activeTab" 
  ]
}