After the latest Firefox update (65.0) when I select dark theme it fails to work in places. Best example of this is when using the element inspector, it opens with a white background and not the usual dark background as should be applied with the dark theme. The window top bar, above the tabs is also now showing as a light grey instead of the normal dark black, usually when a window was selected it would have the dark black and when a window was behind another window in the background it would have a light grey, this seems to have been inversed. I was using the dark theme before the upgrade and had no problems, after the update the dark theme still showed selected and I have also tried reinstalling the browser to solve this issue, however it has persisted. Not a major issue being only styling, but a little frustrating having once had it working correctly to now have it taken away from me! Many Thanks, Mike