Examine source code of Hookmark

{
  "description": "A chrome extension built so that you can save your time finding valuable resources online and get hooked to them",
  "version": "1.3",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "haridarshan@gmail.com",
      "strict_min_version": "55.0"
    }
  },
  "name": "Hookmark",
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon-34.png"
  },
  "icons": {
    "128": "icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "<all_urls>"
      ],
      "js": [
        "contentScript.bundle.js"
      ],
      "css": [
        "content.styles.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "content.styles.css",
    "icon-128.png",
    "icon-34.png"
  ]
}