He's having a problem with Firefox not letting graphics show in color. He says Windows 10, Edge is fine. He said this started after he installed Windows 10.

Installation was as I post in mod forum, so we know he has two operating systems running on that computer. I told him I had no idea what's going on because I have yet to install Windows 10 to my computer.

My first suggestion was he's got a conflict with the two systems, next I thought Windows 10 changed his graphics driver to their own driver. Next an update could have caused this, he says he can't find the entries for updates.

His Firefox is the latest version.

If you can understand what I wrote above, please give me something I can help him with to fix this problem.

Dell Optiplex 670, I think. And it's not showing photos on pages even in Edge.