Examine source code of DikiSerach

{
  "manifest_version": 2,
  "name": "DikiSerach",
  "version": "1.0",
  "description": "Search www.diki.pl for translation",
  "icons": {
    "32": "favicon.png"
  },
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}