Examine source code of No Marketplace

{
  "manifest_version": 2,
  "name": "No Marketplace",
  "version": "0.1.9",
  "description": "Remove Marketplace from Facebook Homepage",
  "icons": {
    "16": "icon1.png",
    "48": "icon1.png",
    "128": "icon1.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://www.facebook.com/*",
        "https://www.facebook.com/*"
      ],
      "js": [
        "jQuery-3.3.1.min.js",
        "content.js"
      ]
    }
  ]
}