Define

manifest.json

{
  "update_url": "http://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Define",
  "version": "2.0.1",
  "options_page": "options.html",
  "description": "Get the definition/synonym of any word in a webpage.",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "omnibox": {
    "keyword": "df"
  },
  "permissions": [
    "contextMenus",
    "tabs"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jquery-1.4.2.js",
        "jquery.hotkeys.js",
        "content.js"
      ]
    }
  ]
}