Quick Definition

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Quick Definition",
  "short_name": "Quick Definition",
  "description": "Highlight a word to see its definition in a popup.",
  "version": "1.0",
  "author": "Michael Zaruba",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "define.js"
      ],
      "css": [
        "define-styles.css"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "x.png"
  ],
  "icons": {
    "16": "icon_16.png",
    "48": "icon_48.png",
    "128": "icon_128.png"
  }
}