When I highlight some text on eg. github.com or kagifeedback.org and select "Translate with Kagi" from the context menu, I get a popup that looks like the one below (I've selected some text in the popup to show that the text is there it's just invisible). I think the problem is related to the prefers-color-scheme media query because toggling light color scheme simulation from Firefox dev tools fixes it.
I'm using Kagi Translate extension 0.1.6-alpha15 on Firefox 147.0.2 (64-bit) on Linux.
I expected text in the translation popup to be legible.
