Super sorry for that!

The toolbar button only switches the theme when 'manual' method is selected (otherwise, time/weather method check every 5 minutes for an update on time/cloudiness, so manual choices would be overridden every 5 minutes). So first, please do select manual method in the 'Preferences' page for Zen Fox, and then save. That should get the button working.

Next, in v1.5 it would appear upon install that manual was already selected on that settings page, but you would actually need to hit save anyway — in the latest update, it is not pre-selected any more. Hopefully that should clarify that the user needs to choose. I'll add this to the description too, and get to work on hiding the button when incompatible methods are selected.

A question: Do you think that a settings page is the right way to go about options, or a popup that drops from pressing the toolbar button?

Thank you for your kind words and review <3, and for taking the time to attach that screenshot!

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EDIT: I can't reply to a review again, so I'm editing this old response too!

After the latest updates, if in Weather/Time mode, clicking the toolbar button opens the settings page (upon seeing which, the user should hopefully realize they are not in manual mode). Clicking it while in manual mode changes the theme, as it should. Additionally, hovering on the toolbar button also tells you the current mode, so it should be clearer.

I think the above process is clear enough for now, without the added complication of a popup for such a simple theme :)