Examine source code of Weblio search

{
  "manifest_version": 2,
  "name": "Weblio search",
  "description": "Adds a position in context menu to search words in Weblio J-J dictionary.",
  "version": "1.2resigned1",
  "icons": {
    "48": "icons/logo_48.png",
    "64": "icons/logo_64.png",
    "96": "icons/logo_96.png"
  },
  "applications": {
    "gecko": {
      "id": "muzyczka.michal@gmail.com"
    }
  },
  "permissions": [
    "contextMenus",
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}