Simply doesn't work

不能页内翻译，需要提交url到google服务器去翻译，无法获取cookie等内容，需要登录的网页无法进行翻译

Sometimes it works but not always. Must be a bug somewhere.

When I attempted to use Google Translator for Firefox by nobzol, nothing at all happened. There were no instructions or hints at all on how to use it.

It is a good plugin. But I think the following plugin has better performance and easier access for translation and is much like Google Translator itself. Of course, this is a personal opinion. I communicated more with this
Plugin Name: Page Translator by Fire360Boy

Excelente