Examine source code of Load Time

{
  "manifest_version": 2,
  "name": "Load Time",
  "version": "0.3",
  "description": "Adds an icon to the address bar to provide load time information of the current page.",
  "icons": {
    "48": "icon.svg"
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "page_action": {
    "browser_style": true,
    "default_icon": "action.svg",
    "default_popup": "popup.html"
  },
  "commands": {
    "_execute_page_action": {}
  }
}