Examine source code of Simple Timer

{
  "manifest_version": 2,
  "name": "Simple Timer",
  "version": "1.0",
  "description": "A simple timer with start, pause, and reset functions",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Simple Timer",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9ca81c07-c54f-4a7f-9ad9-c4d9696049f2}"
    }
  }
}