Examine source code of Clear Cache Buttonx

{
  "manifest_version": 2,
  "name": "Clear Cache Button",
  "version": "1.0",
  "description": "Quickly clears browser cache with one click.",
  "permissions": [
    "browsingData",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Clear Cache"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e1c9ab7d-ca39-4b7e-af78-774df0bb040b}"
    }
  }
}