[ubuntu] Window Firefox Preferences in Ubuntu VirtualBox

Hi All,
The window inside Ubuntu for the settings of Firefox is not completely visible. I cannot scroll down completely or see the whole window.
I need to change some Firefox network settings which I use inside Ubuntu inside Oracle VM VirtualBox.
Hope there is someone who can help me out.

Thank you in advance!

Kind regards

Attached Images

Ubuntu printsreen Firefox instelling (Medium).JPG (63.2 KB)