Examine source code of Change Case by mr.lostov

{
  "manifest_version": 3,
  "name": "Change Case by mr.lostov",
  "version": "2.2.2",
  "browser_specific_settings": {
    "gecko": {
      "id": "manuchehr@jalolov.ru",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "data_collection_permissions": {
    "on_by_default": false,
    "opt_in_required": false,
    "can_be_disabled": true
  },
  "description": "расширения с горячими клавишами",
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "contextMenus"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "toggle-uppercase": {
      "suggested_key": {
        "default": "Ctrl+Alt+U",
        "mac": "Command+Alt+U"
      },
      "description": "Преобразовать в UPPERCASE регистр"
    },
    "toggle-lowercase": {
      "suggested_key": {
        "default": "Ctrl+Alt+L",
        "mac": "Command+Alt+L"
      },
      "description": "Преобразовать в lowercase регистр"
    },
    "toggle-titlecase": {
      "suggested_key": {
        "default": "Ctrl+Alt+K",
        "mac": "Command+Alt+K"
      },
      "description": "Преобразовать в Title Case регистр"
    },
    "toggle-sentencecase": {
      "suggested_key": {
        "default": "Ctrl+Alt+S",
        "mac": "Command+Alt+S"
      },
      "description": "Преобразовать в Sentence case регистр"
    },
    "toggle-pascalcase": {
      "suggested_key": {
        "default": "Ctrl+Alt+P",
        "mac": "Command+Alt+P"
      },
      "description": "Преобразовать в PascalCase регистр"
    },
    "toggle-camelcase": {
      "suggested_key": {
        "default": "Ctrl+Alt+C",
        "mac": "Command+Alt+C"
      },
      "description": "Преобразовать в camelCase регистр"
    },
    "toggle-constantcase": {
      "description": "Преобразовать в CONSTANT_CASE регистр"
    },
    "toggle-snakecase": {
      "description": "Преобразовать в snake_case регистр"
    },
    "toggle-dotcase": {
      "description": "Преобразовать в dot.case регистр"
    }
  },
  "icons": {
    "16": "assets/icon16.png",
    "19": "assets/icon19.png",
    "38": "assets/icon38.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Сменить регистр",
    "default_icon": "assets/icon-48.png"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  }
}