Fahrenheit 451 is a free Chrome add-on developed by dkcyeo. This handy tool allows users to easily convert Fahrenheit temperatures to Celsius as well as US measures into metric units. The program converts Fahrenheit to Celsius, rounding the result to the nearest whole number. It also converts pounds and ounces to grams, and quarts and pints to milliliters.

However, it is important to note that the program currently does not support the conversion of cups. This is because cup measurements depend on the density of the substance being measured and require additional calculations. The developer has mentioned that they are working on adding this functionality in the future.

Fahrenheit 451 is released under a Creative Commons CC BY-NC-SA license, allowing users to freely use and distribute the program. The source code is also available on GitHub for those interested in exploring or contributing to the project.

Overall, Fahrenheit 451 is a useful add-on for Chrome users who frequently need to convert Fahrenheit temperatures and US measures into metric units. Its simple interface and accurate conversions make it a handy tool for everyday use.