Examine source code of Dic_Anywhere

{
  "name": "Bing Dictionary",
  "version": "1.0",
  "description": "Using Bing Dictionary",
  "manifest_version": 2,
  "icons": {
    "16": "favicon.png",
    "32": "favicon.png",
    "48": "favicon.png",
    "128": "favicon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "bing.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2fff79b1-4175-48df-a859-c3e297da8ce3}"
    }
  }
}