I've been tinkering a lot with the drivers for my Intel HD Graphics CPU - installing different drivers and activating SNA. So far without breaking anything.
The only change I've noticed is that the background colour when viewing an image in Firefox (when the URL is the exact location of an image file, that is) has changed.
The default colour for this has been dark grey for some time. For me it has changed to a sort of grainy grey melange colour:
Is this due to my graphics settings - or is it due to a Firefox update, I haven't been able to track down?