It is probably the x11 composite module.
Insert this into your firefox script /usr/bin/firefox:
export XLIB_SKIP_ARGB_VISUALS=1
Or disable the composite module by deleting
Type: Posts; User: Lazar/A; Keyword(s):
It is probably the x11 composite module.
Insert this into your firefox script /usr/bin/firefox:
export XLIB_SKIP_ARGB_VISUALS=1
Or disable the composite module by deleting