Examine source code of QuArk

{
  "description": "Download all your content.",
  "manifest_version": 2,
  "name": "QuArk",
  "version": "21.2",
  "homepage_url": "https://www.ominax.com/quark",
  "icons": {
    "19": "boat_19.png",
    "38": "boat_38.png",
    "48": "boat_48.png"
  },
  "browser_action": {
    "default_icon": {
      "19": "boat_19.png",
      "38": "boat_38.png",
      "48": "boat_48.png"
    },
    "default_title": "QuArk - Download Quora"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "tabHide"
  ],
  "web_accessible_resources": [
    "ark.jpg"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.quora.com/*"
      ],
      "js": [
        "inject.js"
      ]
    }
  ]
}