Examine source code of Search Selection

{
  "name": "Search Selection",
  "description": "Search for selected word in popular search Engines",
  "version": "1.1resigned1",
  "manifest_version": 2,
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "bg.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0aebe630-7577-437e-b33e-e898e2da3174}"
    }
  }
}