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Calc is a Firefox Extension.

You can download it from the Firefox Add-Ons site.

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This extension places a simple calculator into your Firefox Sidebar.

There are several ways to access the calculator. First, go to the top of your browser and click View > Sidebar > Calc:

 

 

The calculator will open up in your sidebar:

 

 

You can also open the calculator with a toolbar button.

First you must manually place the button on your toolbar. Go to View > Toolbars > Customize.

You will then find two calculator buttons in the pop-up window:

 

 

The CalcPop button means the calculator will open in a pop-up window instead of in the sidebar.

Left-click on the button of your choice and drag it to your toolbar:

 

 

Click on the button to open up the calculator.