Examine source code of Synonymous

{
  "manifest_version": 2,
  "name": "Synonymous",
  "version": "1.1",
  "description": "Tells the meaning of a word",
  "icons": {
    "48": "icons/border-48.png"
  },
  "permissions": [
    "https://api.dictionaryapi.dev/api/v2/entries/en/*",
    "activeTab",
    "webRequest"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "synonymous.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fc8c4c87-b5ef-4b68-a342-774090a7384a}"
    }
  }
}