Examine source code of Manage Multi URL

{
  "manifest_version": 2,
  "name": "Multi URL Fetch Tabs",
  "description": "This extension read current window's tabs..",
  "version": "2.0",
  "browser_action": {
    "default_icon": "img/icon.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "tabs",
    "bookmarks"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://localhost:44372/Category/Create",
        "http://qamvc.alliancetek.org/multiurl/Category/Create",
        "http://qamvc.alliancetek.org/multiurl/*",
        "https://qamvc.alliancetek.org/multiurl/Category/Create",
        "https://qamvc.alliancetek.org/multiurl/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{99fb0846-a47c-4033-b783-f0ecfffb2ab3}"
    }
  }
}