Examine source code of Page Load Time Indicator

{
  "manifest_version": 2,
  "name": "Page Load Time Indicator",
  "version": "1.0",
  "description": "Displays page load time on a small bar at the bottom of the browser, helping users assess the performance of websites they visit.",
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    },
    "default_title": "Page Load Time Indicator"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{13413955-1c32-402f-9830-7541ebd1c6cd}"
    }
  }
}