Examine source code of Google Keep (Pin Tab)

{
  "name" : "Google Keep (Pin Tab)",
  "description" : "Switch to Google Keep (Pin Tab) with a single click or a Hot Key (Alt+K)!",
  "version" : "4.3",
  "manifest_version" : 2 ,
  "permissions" : [
    "storage" ,
    "tabs" 
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "icons" : {
    "48" : "icons/icon.png"
  },
  "browser_action" : {
    "default_icon" : "icons/icon.png",
    "default_title" : "Switch to Google Keep (Pin Tab)"
  },
  "options_ui" : {
    "page": "options/options.html" 
  },
  "commands" : {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+K"
      },
      "description" : "Switch to Google Keep (Pin Tab)"
    }
  }
}