Examine source code of Lyric Finder

{
  "manifest_version": 3,
  "name": "Lyric Finder: Find Song by Lyrics",
  "version": "1.6.3",
  "description": "Find songs by partial lyrics, search song lyrics, and access lyric translations instantly.",
  "action": {
    "default_title": "Lyric Finder – Find Song by Lyrics",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "omnibox": {
    "keyword": "lf"
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "lyricfinder-extension@addons.mozilla.org"
    }
  }
}