Examine source code of Quick Translator

{
  "manifest_version": 2,
  "name": "Quick Translator",
  "description": "A quick text translator from any language to English.",
  "version": "1.0.0",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon90.png",
    "default_popup": "index.html",
    "default_title": "Quick Translator"
  },
  "permissions": [
    "activeTab"
  ]
}