u/OneLonelyBrainCell

I have two Firefox installations on two different Linux laptops. On one I played around on color.firefox.com and made a simple gray/orange theme. It's not really an actual theme that you can isntall, but something that overwrites the colors for various parts of the UI. At that time, I had my Firefox account set to also sync Add-ons and Settings.

A few days later I freshly installed Linux on a second laptop and went completely Dracula themed (https://draculatheme.com/), including this Dracula theme from addons.mozilla.org.

The problem I'm having is that the gray/orange "theme" I made keeps overwritting the Dracula theme. I have since disabled syncing for Add-ons and Settings, went into about:config and changed services.sync.prefs.sync.extensions.activeThemeID to false, yet it still keeps happening.

The weird thing is that it says that the Dracula theme is still enabled in the Extensions & Themes settings. When I disable and re-enable the Dracula theme, it stays that way for sometimes a few minutes, sometimes just a few seconds. The same thing happens when I enable any other theme -- it changes to the gray/orange thing I made after a short time.

So, how do I completely remove the "theme" I made on color.firefox.com? It was fun playing around, but is more trouble than it's worth.