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Sorry for the confusion. "Settings->Personalization->Colors" are the settings in W10, not in FF!...
I found a way to easy fix the problem (thanks again to ThomasB16). 1 Settings|Personalization|Colors ->unchecked the show accent color in "Title...
I can confirm the effect of the settings ThomasB16 mentioned. It works exactly the same way on our W10 pro 32bit VM. Thanks a lot for helping!...
@alexg, we have sent the report (ID 226982035)
@alxg: Yes, we removed the profile (%appdata%\Mozilla\Firefox\Profiles) before installing FF57.
So we performed all the steps alexg proposed. Unfortunally there is no success. After the clear installation of FF56 everthing worked, 5 minutes...
Same problem here. We have 32 identical machines, one virtuell and 31 real. W10 1510 32-bit on all of them. All installed Windows updates are...