[openbox] I need to disable 3D graphics instructions set

[Mgr. Janusz Chmiel]

Thank you very much for yours answer.
Unfortunately, since I share Debian latest stable ARM64 bit with Android 
kernel, I think, that error messages of Firefox are being caused by The 
fact, that GTK library is helpless to draw graphical objects. I will try 
to disable pictures loading from The Internet.
Since I have read some articles, that trying to run startx and XORG on 
touching Android devices can damage The displays, because perhaps Xorg 
modules are containing some algorithms for monitor calibration. But may 
be, that it is not true.
So thank you and I know, that window manager can not disable graphics 
drawing on The display.
I have disabled 3D acceleration on The Firefox preferences.