79.0 (64 bits) Mozilla Firefox for Fedora fedora-1.0 I turned on dark mode and was disappointed that the only thing that turned dark was the tab bar. I googled and people suggest Dark Reader. I have that on. Is this the correct way to get dark reading in Firefox with 79? Here is a way to reliably reproduce the white flash. Open gmail. On the left open a chat that has a photo in it. Click on the photo to open it in another tab of its own. There will be a white flash when the tab with the photo opens. -- original use case, not reliably reproducible -- Now I hit '+' on the tab bar and get a new tab. In the browser dialog I type, say, 'time in New York' then there is a bright white flash like I am getting my picture taken. After this I make an appointment with my ophthalmologist and find I have retina damage. If I repeat this procedure it does not do it a second time. I go to another tab, return to the google search results for time in New York, and hit refresh, the it flashes again. I hit refresh a second time and it does not flash. So there are sporadic unpredictable white flashes. ----- How do you turn off the damage your eyes white flash feature? Where is that setting, surely I am missing it somewhere. I am curious as to why this problem has persisted for so many years, why is it so hard to fix.