Examine source code of Mock API Manager

{
  "manifest_version": 2,
  "name": "Mock API Manager",
  "version": "1.1",
  "description": "Create, manage, and apply mock APIs to specific URLs.",
  "permissions": [
    "storage",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icons/logo_32.png",
      "64": "icons/logo_64.png",
      "128": "icons/logo_128.png"
    }
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{698e38df-6c1f-4c95-bd57-38b80e6e6eae}"
    }
  }
}