Examine source code of Haloscan

{
  "manifest_version": 3,
  "name": "Haloscan",
  "description": "Haloscan web extension",
  "version": "1.2",
  "icons": {
    "128": "128.png"
  },
  "action": {
    "default_popup": "dist/index.html",
    "default_icon": "haloscan.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.google.com/*",
        "*://www.google.fr/*"
      ],
      "js": [
        "serpRankInsert.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "contentStyle.css"
      ],
      "js": [
        "highlightLinks.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "storage"
  ],
  "options_page": "settings.html",
  "host_permissions": [
    "https://*.haloscan.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@haloscan.com",
      "strict_min_version": "58.0"
    }
  }
}