Examine source code of Load Times

{
  "author": "igorlogius",
  "homepage_url": "https://github.com/igorlogius/webextensions/tree/main/load-times",
  "browser_style": true,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_area": "navbar",
    "default_title": "Show loading times of all tabs",
    "default_popup": "popup.html"
  },
  "page_action": {
    "browser_style": true,
    "default_title": "Show loading time of the current tab",
    "default_popup": "popup.html?activeTab=1"
  },
  "icons": {
    "128": "icon.png"
  },
  "manifest_version": 2,
  "name": "Load Times",
  "permissions": [
    "tabs",
    "webNavigation"
  ],
  "version": "1.4.8",
  "browser_specific_settings": {
    "gecko": {
      "id": "{4e6788b2-56ed-4f43-b789-70aa1ed30b92}"
    }
  }
}