Examine source code of Control Center

{
  "manifest_version": 2,
  "name": "Control Center",
  "version": "1.3.7",
  "description": "Control Center for Firefox",
  "icons": {
    "48": "icons/logo-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://open.spotify.com/*"
      ],
      "js": [
        "content-scripts/open.spotify.com/player-controls.js"
      ]
    },
    {
      "matches": [
        "*://music.youtube.com/*"
      ],
      "js": [
        "content-scripts/music.youtube.com/player-controls.js"
      ]
    },
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content-scripts/youtube.com/removes-youtube-shorts.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background/index.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "option/index.html"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "contextualIdentities"
  ],
  "commands": {
    "control-center": {
      "suggested_key": {
        "default": "Alt+J",
        "mac": "Command+MacCtrl+J"
      },
      "description": "toggle control center tab"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "control-center@nxtcoder17.me",
      "strict_min_version": "63.0"
    }
  },
  "browser_action": {
    "default_icon": "icons/logo-48.png",
    "default_title": "Control Center"
  }
}