Examine source code of Cloudflare Cache Purger

{
  "manifest_version": 2,
  "name": "Cloudflare Cache Purger",
  "version": "1.3",
  "description": "Purge Cloudflare cache for current page",
  "permissions": [
    "storage",
    "activeTab",
    "https://api.cloudflare.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "CF Cache Purger"
  },
  "options_ui": {
    "page": "settings.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "cf-cache-purger@srpc.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}