I ran into an issue with the Alpenglow extension conflicting with the Dark Mode extension.

On version 105.0.1 (It may happen on other versions, it's just that I only tested it on that version.), all of the default themes, ran into defaults where they tend to fallback to the Default Dark Theme, which, while totally usable, is not the theme I wanted. The Alpine Theme was the theme that I tested with first, but it's actually also an issue on the Light theme as well. Both themes tested were official themes that were made by Mozilla, not a third-party.