Examine source code of Parachord

{
  "manifest_version": 3,
  "name": "Parachord",
  "version": "0.4.0",
  "description": "Connect your browser to Parachord desktop for playback control and content discovery",
  "permissions": [
    "activeTab",
    "scripting",
    "alarms",
    "tabs",
    "contextMenus",
    "storage",
    "webNavigation",
    "nativeMessaging"
  ],
  "host_permissions": [
    "https://www.youtube.com/*",
    "https://youtube.com/*",
    "https://*.bandcamp.com/*",
    "https://bandcamp.com/*",
    "https://open.spotify.com/*",
    "https://music.apple.com/*",
    "https://www.last.fm/*",
    "https://last.fm/*",
    "https://listenbrainz.org/*",
    "https://pitchfork.com/*",
    "https://soundcloud.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/watch*",
        "https://youtube.com/watch*",
        "https://*.bandcamp.com/track/*",
        "https://*.bandcamp.com/album/*",
        "https://bandcamp.com/*/playlist/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://open.spotify.com/*"
      ],
      "js": [
        "content-spotify.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://music.apple.com/*"
      ],
      "js": [
        "content-applemusic.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://pitchfork.com/reviews/albums/*",
        "https://pitchfork.com/reviews/tracks/*"
      ],
      "js": [
        "content-pitchfork.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://soundcloud.com/*"
      ],
      "js": [
        "content-soundcloud.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*/*"
      ],
      "exclude_matches": [
        "*://open.spotify.com/*",
        "*://music.apple.com/*",
        "*://www.youtube.com/*",
        "*://youtube.com/*",
        "*://soundcloud.com/*"
      ],
      "js": [
        "content-inline.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/icon16.png"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "parachord@parachord.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}