The JavaScript runtime used in the latest versions of Mozilla projects including both Firefox and Thunderbird has full support for ECMAScript 5.1 features.
El motor de JavaScript utilizado en las últimas versiones de los proyectos de Mozilla, incluyendo Firefox y Thunderbird, tienen soporte a todas las características de ECMAScript 5.1.
Mozilla supports two ways to attach events through JavaScript.
It also has important limitations such as the dynamic management of javascript at runtime.
También tiene limitaciones importantes como son la gestión dinámica de javascript en tiempo de ejecución.
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