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Calculator has an interface similar to Microsoft Powertoy Calculator and it offers great features like history, conversions, many functions... And it's a great open source replacement to the calculator included in Windows accessories!
About this Add-on
Calculator is working with Superfish to bring you a similar products finder on the shopping sites you visit. This system allows you to find better deals when shopping online. It instantly compares prices and finds similar products on millions of products on the web. You can disable this feature in the extension preferences.