Examine source code of Search Again

{
  "manifest_version": 2,
  "name": "Search Again",
  "version": "0.2resigned1",
  "description": "Re-runs current search with another engine",
  "permissions": [
    "search",
    "tabs"
  ],
  "omnibox": {
    "keyword": "sa"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7b1f81bd-ec0a-41bc-b8e1-c2c653a67c11}"
    }
  }
}