I was repeatedly sent to Firefox Color to this to "create my own theme" after update to 68.2esr removed my UI. Have created and saved 5 times but the theme is gone on restart. There are no instructions on how to "add" the saved theme to my themes. Is this just a toy? Or can I somehow continue to use the theme I want? Is there any info on this anywhere? Nice interface and easy to use, but a disappointing waste of time so far.