Math in Address Bar is a Firefox extension designed for quick arithmetic and trigonometric calculations directly from the browser's address bar. By typing commands like 'math 10+20*30/40', users receive immediate answers in a dropdown menu, enhancing productivity for developers and IT professionals. The extension supports a variety of mathematical functions and constants, including trigonometric operations and logarithmic calculations, making it versatile for various applications.

Additionally, this tool allows users to save their last 30 calculations, which can be accessed easily through an Address Bar icon. It streamlines the process by providing real-time feedback on equation validity, ensuring that users can correct any errors on the fly. This functionality is particularly beneficial compared to traditional methods like JavaScript or bookmarklets, as it offers a more efficient, keyboard-driven experience.