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ContextCalc 0.4.2.1-signed.1-let-fixed.1-signed Requires Restart
Computes a user-defined math expression on the numbers found in the selected text and shows the result in the context menu.
About this Add-on
It shows the result of the computation of a user-defined formula/equation using the numbers found in the selected portion of the webpage when the context menu was invoked.
This extension is very useful to compute repetitive formulas when doing web researches. E.g. many websites show items with prices which are not including the VAT tax; entering the formula "x*1.21" in ContextCalc allows you to immediately know the prices VAT-included (1.21 is for VAT equal to 21%): just select the price on the webpage and right-click!
The extension supports lots of mathematical functions and the most common constants.
Contact me if you find bugs, you want to propose feature requests or you just want to tell me that this extension is useful to you :)