Firefox User here since Netscape Navigator. Problem occurred with latest Firefox release as far as I can tell. This rig works flawlessly with everything but Firefox and Thunderbird Chrome and Edge have no problems. All my apps operate normally. Almost all aspects of the browser/ display window are corrupt. Chrome and Edge and all apps function without issue. Included are two screen shots In attempts to resolve this issue I have uninstalled the video driver several times, including the use of DDU. I have done a deep uninstall of Firefox, including cleaning the registry and all hidden files. I have tried the latest video driver and several earlier versions; all exhibit the same issue. I can't use Firefox and its driving me nuts. I'd like to understand why Thank you for any advice and hints in advance