Popup dictionary with pronunciation Firefox

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manifest.json
{
  "manifest_version": 2,
  "name": "Buttress Vocabulary",
  "version": "2.2.1",
  "description": "Strengthen your vocabulary while reading things on browser.",
  "browser_action": {
    "default_icon": "icons/128book.png",
    "default_title": "ButtressVocab",
    "default_popup": "popup/index.html"
  },
  "icons": {
    "128": "icons/128book.png"
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "scripts/jquery-3.3.1.min.js",
      "scripts/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "scripts/jquery-3.3.1.min.js",
        "scripts/presenter.js"
      ]
    }
  ]
}

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