Examine source code of Lookahead

{
  "manifest_version": 3,
  "name": "Lookahead",
  "version": "1.3.1",
  "description": "Automatically open the best search result for your query.",
  "icons": {
    "48": "icons/lookahead-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@lookahead.vmargb",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "120.0"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "scripting",
    "tabs",
    "declarativeNetRequest",
    "declarativeNetRequestWithHostAccess"
  ],
  "host_permissions": [
    "https://duckduckgo.com/*",
    "https://www.google.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_icon": {
      "48": "icons/lookahead-logo.png"
    },
    "default_title": "Look Ahead",
    "default_popup": "popup.html"
  },
  "omnibox": {
    "keyword": "la"
  },
  "commands": {
    "next-result": {
      "suggested_key": {
        "default": "Shift+Alt+L"
      },
      "description": "Open the next best search result"
    },
    "previous-result": {
      "suggested_key": {
        "default": "Shift+Alt+O"
      },
      "description": "Open the previous result"
    },
    "show-mini-popup": {
      "suggested_key": {
        "default": "Shift+Alt+P"
      },
      "description": "Show mini popup with all results"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://duckduckgo.com/*",
        "https://www.google.com/*",
        "https://www.startpage.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "mini-popup-content.js"
      ],
      "css": [
        "mini-popup.css"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "preview.html",
        "mini-popup.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}