Thunderbird for macOS: a dark app icon that follows system appearance

[drikodrk]

Hello Thunderbird team,

I use my Mac in Dark Mode, but Thunderbird's application icon keeps a bright white rounded-square background in the Dock and Finder. It stands out against the dark appearance of the system.

Could Thunderbird provide a native dark icon variant with a black or dark charcoal background, while preserving the blue bird and the envelope? Ideally, the icon would follow macOS's light/dark icon appearance automatically, while retaining the current light variant for users who prefer it.

This request concerns the macOS application icon, not the Thunderbird interface theme or email background colours. I have attached an illustrative custom mockup of the desired dark variant; it is not an official Thunderbird asset.

Environment: Thunderbird 159.0 on macOS 27.2.

Thank you for considering this small improvement to visual consistency.