Mozilla Firefox Icon System, Stroke Weights with Decimal Values

Our Firefox icon system uses stroke weights with decimal values. Taking into account specific visual rules and icon sizes, we used 1.25 px and 1.5 px strokes. Icons with decimal numbers align with the pixel grid on one side to ensure legibility at small sizes. Additionally, we implemented a special-cut spacing logic of 0.6 px for 16 px icons 📐✨