Examine source code of Clear Cache Now

{
  "manifest_version": 2,
  "name": "Clear Cache Now",
  "version": "1.0",
  "description": "Quickly clear browser cache with one click",
  "permissions": [
    "browsingData"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icon.png"
    },
    "default_title": "Clear Cache"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a94f4468-2dd8-4cd4-9ec1-ac297b172bb2}"
    }
  }
}