Examine source code of Client Side Bangs

{
  "manifest_version": 2,
  "name": "ClientSideBangs",
  "version": "0.3.4",
  "description": "Redirects certain bangs on the client side instead of asking DDG, allowing for a faster search experience and customization",
  "icons": {
    "48": "images/ddg-48.png"
  },
  "permissions": [
    "*://duckduckgo.com/*",
    "*://www.google.com/*",
    "webRequest",
    "storage"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ddgcsbr@example.com"
    }
  },
  "background": {
    "scripts": [
      "lib.js",
      "main.js"
    ]
  }
}