Examine source code of URL Guard

{
  "manifest_version": 2,
  "name": "URL Guard",
  "version": "1.0",
  "description": "This add-on intercepts clicks, analyzes URLs before navigation, and asks for user confirmation. It helps prevent phishing, malicious links, and accidental clicks. While it may slow normal browsing, it can be easily turned off during routine use and re-enabled when reading suspicious emails or visiting unknown websites. Special thanks to Filipe Kane for the artwork.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Toggle URL Guard"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{055bd1ba-7518-472d-9e98-a84bcf25a79e}"
    }
  }
}