Examine source code of Tab Switcher TV

{
  "manifest_version": 2,
  "default_locale": "en",
  "name": "__MSG_extension_name__",
  "version": "1.1.6",
  "description": "__MSG_extension_description__",
  "author": "User",
  "browser_specific_settings": {
    "gecko": {
      "id": "{2bf764ff-09fc-44af-9896-76d9b7a77af4}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "config.js",
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.svg",
      "32": "icons/icon-32.svg",
      "48": "icons/icon-48.svg"
    },
    "default_title": "__MSG_browser_action_title__"
  },
  "icons": {
    "16": "icons/icon-16.svg",
    "32": "icons/icon-32.svg",
    "48": "icons/icon-48.svg",
    "96": "icons/icon-96.svg"
  },
  "web_accessible_resources": [
    "inject/audio-script.js",
    "inject/video-script.js",
    "inject/key-blocker.js"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*",
        "*://*.twitch.tv/*",
        "*://*.kick.com/*",
        "*://*/*"
      ],
      "js": [
        "config.js",
        "content/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "commands": {
    "switch-tab-left": {
      "suggested_key": {
        "default": "Alt+Shift+Left"
      },
      "description": "__MSG_cmd_switch_left__"
    },
    "switch-tab-right": {
      "suggested_key": {
        "default": "Alt+Shift+Right"
      },
      "description": "__MSG_cmd_switch_right__"
    },
    "switch-tab-history-back": {
      "suggested_key": {
        "default": "Alt+Shift+Down"
      },
      "description": "__MSG_cmd_history_back__"
    },
    "switch-tab-history-forward": {
      "suggested_key": {
        "default": "Alt+Shift+Up"
      },
      "description": "__MSG_cmd_history_forward__"
    }
  }
}