Examine source code of Quick Reading Timer

{
  "manifest_version": 2,
  "name": "Quick Reading Timer",
  "version": "1.0",
  "description": "An extension that estimates the time needed to read through a webpage based on word count and reading speed.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon48.png",
      "96": "icons/icon96.png"
    }
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{93204bfe-dd90-42de-ba1b-11ea8c5e6ae7}"
    }
  }
}