Examine source code of Quick Cache Clear

{
  "manifest_version": 2,
  "name": "Quick Cache Clear",
  "version": "1.0",
  "description": "Instantly clear your browser cache with one click.",
  "permissions": [
    "browsingData"
  ],
  "browser_action": {
    "default_icon": "icons/clear-cache-48.png",
    "default_popup": "popup.html",
    "default_title": "Clear Cache"
  },
  "icons": {
    "48": "icons/clear-cache-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3c6105ff-7c3d-4277-a914-c16156d81be0}"
    }
  }
}