Examine source code of Tab-man

{
  "manifest_version" : 2 ,
  "name" : "Tab-man",
  "version" : "1.0.4",
  "description" : "Tab manager ",
  "homepage_url" : "https://github.com/johnfasou/tab-man",
  "permissions" : [
    "activeTab" ,
    "clipboardRead" ,
    "clipboardWrite" ,
    "contextMenus" ,
    "notifications" ,
    "tabs" ,
    "storage" 
  ],
  "browser_action" : {
    "default_icon" : "icons/tabman96.png",
    "browser_style": true,
    "default_title" : "Tab-man",
    "default_popup" : "src/popup.html"
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "icons" : {
    "48" : "icons/tabman48.png",
    "96" : "icons/tabman96.png"
  }
}