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Exch is a currency conversion extension for Firefox that allows you to perform foreign exchange rate calculations on the Internet. It is written in XUL and JavaScript.

Exch is a currency conversion tool that displays publicly available data from Yahoo! Finance in an easy to use sidebar. It also accesses Yahoo! Finance currency graphs for quick access to trend information.

To use Exch, type the value of currency to convert in the amount box, then select the source and destination currencies and hit “OK” to convert using data obtained from Yahoo! Finance.

You can download the latest version of Exch from https://addons.mozilla.org/en-US/firefox/addon/1747.