Very nice Kestrel.

Calling it now, next FFF is "For a Few Frames More", followed by "The Good, The Bad, and the Poorly Optimized"

Sorry for making a second post. I'm still on newbie probation.

I whipped up a basic idea of what the colourblind buttons could look like.
https://i.imgur.com/3VHWMSU.png

The left is the colours as one with normal vision should see them. The right is appears the way someone with Deuteranopia ...

I came on to mention the disabled Confirm button is brighter than normal, while the Back and Cancel buttons are darker when disabled. It might be a good idea to darken the Confirm button when it's disabled to make the style more uniform.
https://i.imgur.com/BLVSd3a.png

The colorblindness problem ...