DietPi

The error is in Firefox, chrome works properly.

I using dietpi on x86. I want to boot the lxde desktop with a specific resolution.
I changed /Dietpi/dietpi.txt adding hdmi options but nothing happen.
In dietpi-config->display-options doesn't appear the screen resolution option.
How can I boot with a specific resolution?
Thank you!

I installed dietpi in a old pc to made a server. Also I want to use this pc to work with my tv. If I run "aplay -D plughw:0,3 /usr/share/sounds/alsa/Noise.wav" I ear correctly in the tv, but if I seet any video on youtube I don't heard any sound. I used lxde and mate, in both cases I don't...

I have installed VNC Server into Raspberry Pi Zero with shared desktop mode, but I need change the port.
I don't know where I need to change this parameter, because I don't know where call to the VNC Server when start XWindows.
I need your help!
Thank you.