Problems withe Firefox

Hi there,

I cannot get the translator plugin Version 3.0.7 running under firefox.
Chrome and IE works fine, firefox does not work.

Either the drop down is empty or you can choose a language but it is not translated.

Any thoughts what i could do? Website is: kuessen-und-kochen.de

Thanks!

https://ww.wp.xz.cn/plugins/google-language-translator/