Examine source code of Watchdog

{
  "manifest_version": 2,
  "name": "Watchdog",
  "version": "1.33",
  "description": "Ensures you don't use compromised passwords",
  "icons": {
    "16": "Watchdog.svg",
    "32": "Watchdog.svg",
    "48": "Watchdog.svg",
    "96": "Watchdog.svg"
  },
  "browser_action": {
    "default_icon": "Watchdog.svg",
    "default_title": "TR Watchdog",
    "default_popup": "index.html"
  },
  "permissions": [
    "activeTab",
    "webRequest",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "browser-polyfill.min.js"
    ]
  },
  "web_accessible_resources": [
    "browser-polyfill.min.js",
    "Watchdog.svg",
    "Checkmark.svg",
    "Warning.svg",
    "Warning_White.svg",
    "Loading.gif",
    "ThreatRecordWhite.svg",
    "ThreatRecord.svg"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "browser-polyfill.min.js",
        "watchdog.js"
      ],
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5c0f1056-030b-4964-a19c-042fff07e4e9}"
    }
  }
}