Firefox loses its appearance after 20 or so openings or startups

I have installed FT Graphite Glow 5.11 Classic Compact 16.0.2 Foxdie (Graphite)15 FT DeepDark 5.4 Silvermel

After about 20 or so startup or opening of Firefox, Firefox reverts back to the default appearance. Why??? This has never happened before version 17. What has changed????

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