Examine source code of Webtime Tracker

{
  "manifest_version": 2,
  "name": "Webtime Tracker",
  "description": "Discover your browsing habits! Time tracking at its best.",
  "version": "2.0.3",
  "icons": {
    "16": "icon-16.4821b40c.png",
    "32": "icon-32.5f3f7bf9.png",
    "48": "icon-48.ecb30c17.png",
    "128": "icon-128.5799581f.png"
  },
  "browser_action": {
    "default_icon": {
      "19": "icon-19.0452e9dc.png",
      "38": "icon-38.3e5f884f.png"
    },
    "default_popup": "popup.1329f904.html",
    "default_title": "Webtime Tracker"
  },
  "background": {
    "scripts": [
      "background.4e4f6555.js"
    ]
  },
  "permissions": [
    "tabs",
    "idle",
    "storage",
    "unlimitedStorage"
  ],
  "optional_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{73f29a32-12a4-429e-9c14-794a42f251df}"
    }
  }
}