Examine source code of HTTP Protocol Info

{
  "manifest_version": 2,
  "name": "HTTP Protocol Info",
  "description": "Displays HTTP protocol version and page load time for the current tab",
  "version": "1.0",
  "icons": {
    "64": "icons/icon64.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/icon64.png",
    "default_title": "HTTP Protocol Info",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{56024762-e698-4251-8172-f225332ade52}",
      "strict_min_version": "93.0"
    }
  }
}