Examine source code of SoundCloud Player

{
  "manifest_version": 2,
  "name": "SoundCloud Player",
  "short_name": "SC Player",
  "description": "SoundCloud Popup Player 🔥",
  "version": "1.3.8",
  "homepage_url": "https://akiba.cloud/soundcloud-player/",
  "permissions": [
    "tabs",
    "clipboardWrite"
  ],
  "background": {
    "scripts": [
      "background/bg.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "browser-polyfill.min.js",
        "jquery-3.6.4.min.js",
        "contents/contents.js",
        "contents/utils.js"
      ],
      "matches": [
        "*://soundcloud.com/*"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "commands": {
    "open": {
      "description": "Open the tab."
    },
    "toggle": {
      "description": "Toggle the audio."
    },
    "prev": {
      "description": "Play previous track"
    },
    "next": {
      "description": "Play next track"
    },
    "fav": {
      "description": "Add/Remove current track to the favorite list."
    },
    "repeat": {
      "description": "Shift change the repeat mode. (order: SINGLE, ALL, NONE)"
    },
    "shuffle": {
      "description": "Toggle shuffle mode."
    },
    "mute": {
      "description": "Toggle mute."
    },
    "up": {
      "description": "Audio volume up"
    },
    "down": {
      "description": "Audio volume down"
    },
    "seekb": {
      "description": "Seek a bit backward."
    },
    "seekf": {
      "description": "Seek a bit forward."
    },
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Alt+S"
      },
      "description": "Open the popup"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{896fd720-ed7c-4158-b0b9-956e14843939}"
    }
  }
}