Examine source code of 🚀 Ad Speed

{
  "manifest_version": 2,
  "name": "🚀 Ad Speed",
  "version": "1.0.0",
  "description": "🚀 Ad Speed measures the initial response time from ad servers to help optimize ad performance.",
  "permissions": [
    "webRequest",
    "webNavigation",
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Ad Speed"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "applications": {
    "gecko": {
      "id": "adspeed@stephane.broquet",
      "strict_min_version": "58.0"
    }
  }
}