Examine source code of Better Progress Bar

{
  "manifest_version": 3,
  "name": "Better Progress Bar",
  "short_name": "BpB",
  "version": "1.2.4",
  "description": "__MSG_extensionDescription__",
  "permissions": [
    "storage",
    "unlimitedStorage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*",
        "*://m.youtube.com/*",
        "*://www.youtube-nocookie.com/*"
      ],
      "js": [
        "src/theme.js",
        "src/content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "background": {
    "service_worker": "src/background.js",
    "scripts": [
      "src/background.js"
    ]
  },
  "action": {
    "default_title": "__MSG_actionTitle__",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "BpB@yuno.addons",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "default_locale": "en"
}