Examine source code of Kid-Friendly Browser

{
  "manifest_version": 2,
  "name": "Kid-Friendly Browser",
  "version": "1.0",
  "description": "Blocks access to inappropriate websites for kids.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5e529ee8-98d6-4afe-b0a2-85d21cb60f28}"
    }
  }
}