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My custom theme keeps getting disabled
I have added the FireFox Carbon custom theme to FireFox. Since the latest update (66.0.1) it keeps getting disabled. I can customize the browser and re-enable it, but then a while later it will be disabled again. I can't tell exactly what event the disabling is tied to, possibly when closing or re-opening the browser, but it doesn't seem to do that every time. No errors are being displayed.
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I just closed my browser and re-opened a couple of times (leaving it closed for a minute or two the second time) and the theme is still there so it doesn't seem to be tied to closing Firefox. Not sure if that means there is something in the background disabling my custom theme or what.
I can say that I use Firefox sync, but all of my synced instances should also be using the carbon theme so nothing should be overwriting my settings. Additionally, I would expect changing the theme back here in this browser would sync the other way as well.
This can happen if there is a problem with the extensions.json file or the prefs.js file in the profile folder.
Do you have cleanup software that might affect files in the hiden profile folder?
Location used for the main profile that keeps your personal data in "AppData\Roaming" (Root Directory on about:profiles).
There is software like Advanced SystemCare with its Surfing Protection feature that can protect files in the Firefox profile folder against changes. If you have such software then check the settings or uninstall this software.