Examine source code of Social Carousel Auto Post

{
  "manifest_version": 2,
  "name": "Social Carousel Auto Post",
  "description": "This is a supplement extension for socialcarouselautopost.com site.",
  "version": "3.1",
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "popup",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://localhost/*",
        "*://*.socialcarouselautopost.com/*"
      ],
      "js": [
        "jquery.js",
        "content-script.js"
      ]
    }
  ],
  "permissions": [
    "cookies",
    "*://*.linkedin.com/*"
  ],
  "icons": {
    "128": "icon.png"
  }
}