Examine source code of Bad Words Blocker

{
  "manifest_version": 2,
  "name": "Search Blocker",
  "version": "2.2.3",
  "description": "Blocks web searches containing certain words.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "storage",
    "*://*.google.com/*",
    "*://*.bing.com/*",
    "*://*.duckduckgo.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "settings.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "options_ui": {
    "page": "settings.html",
    "browser_style": true
  },
  "web_accessible_resources": [
    "blocked-words1.json"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{16989426-43b1-49b2-a206-08ff99d3a04a}"
    }
  }
}