Computed-tab doesn't Sort

[agrigo2s]

Hi,
The Computed-tag shows all attributes in the Others-category. Firebug doesn't sort it anymore and i cant see from where he get a computed value.

Im Using Linux Gnome 16.10 (Ubuntu), Firefox 50 and already reinstalled: Firebug, Firefox AND Linex.
My Notebook is running Firefox 49.0.2 and don't have that issue.

Regards,
Artur