1.9.0 broke dashboard for me (using Firefox)

Hi

I've just updated an Edgerouter Lite from the latest 1.9.0 beta to 1.9.0 and the dashboard is broken on Firefox 48.0. Screenshot attached. Previous versions including the latest beta worked without issues.

I am not at the location now, I access the GUI via a SOCKS5 proxy over a ssh connection, but I've had no issues with previous versions. Chrome is working fine.