Examine source code of jodo search

{
  "manifest_version": 2,
  "name": "jodo search",
  "version": "0.1.1resigned1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/jodo-48.png",
    "128": "icons/jodo-128.png"
  },
  "commands": {
    "search_wikipt": {
      "suggested_key": {
        "default": "Alt+X"
      },
      "description": "Send text to wikipedia portuguese"
    },
    "search_wikien": {
      "suggested_key": {
        "default": "Alt+W"
      },
      "description": "Send text to wikipedia english"
    },
    "search_google": {
      "suggested_key": {
        "default": "Alt+G"
      },
      "description": "Send text to google search engine."
    }
  },
  "content_scripts": [
    {
      "js": [
        "probe.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8a8ac933-508e-401e-97db-4895fd7bdba2}"
    }
  }
}