Examine source code of Kid-Safe Web Filter

{
  "manifest_version": 2,
  "name": "Kid-Safe Web Filter",
  "version": "1.0",
  "description": "Blocks access to inappropriate websites for kids.",
  "permissions": [
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "content.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Kid-Safe Web"
  },
  "web_accessible_resources": [
    "blocklist.json"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{90e28326-4be9-4707-a9ab-c3eac911e7ee}"
    }
  }
}