Examine source code of Tempo Stats

{
  "manifest_version": 3,
  "name": "Tempo Stats",
  "version": "1.0.5",
  "description": "Track music on YouTube Music, Spotify, SoundCloud & more. Sync your listening history to Tempo app.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png"
    },
    "default_title": "Tempo Stats"
  },
  "background": {
    "service_worker": "background/service-worker.js",
    "scripts": [
      "background/service-worker.js"
    ]
  },
  "permissions": [
    "storage",
    "alarms",
    "tabs"
  ],
  "host_permissions": [
    "http://*:8765/*",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://music.youtube.com/*",
        "*://www.youtube.com/*",
        "*://youtube.com/*",
        "*://m.youtube.com/*",
        "*://youtu.be/*",
        "*://open.spotify.com/*",
        "*://soundcloud.com/*",
        "*://www.soundcloud.com/*",
        "*://tidal.com/*",
        "*://listen.tidal.com/*",
        "*://music.apple.com/*",
        "*://music.amazon.com/*",
        "*://music.amazon.in/*",
        "*://www.deezer.com/*",
        "*://deezer.com/*",
        "*://www.pandora.com/*",
        "*://pandora.com/*",
        "*://*.bandcamp.com/*",
        "*://www.last.fm/*",
        "*://last.fm/*",
        "*://www.jiosaavn.com/*",
        "*://jiosaavn.com/*",
        "*://gaana.com/*",
        "*://www.gaana.com/*",
        "*://wynk.in/*",
        "*://www.audiomack.com/*",
        "*://audiomack.com/*",
        "*://play.napster.com/*",
        "*://napster.com/*",
        "*://www.qobuz.com/*",
        "*://qobuz.com/*"
      ],
      "js": [
        "content/media-probe.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://music.youtube.com/*",
        "*://www.youtube.com/*",
        "*://youtube.com/*",
        "*://m.youtube.com/*",
        "*://youtu.be/*"
      ],
      "js": [
        "content/yt-main-world-helper.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tempo-stats@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}