If you do not like calculator that comes with Windows and you do a lot in Firefox or Thunderbird, then you get this extension to be very useful.
Calculator is a complete scientific calculator that integrates in Firefox as an extension; It is also available for Thunderbird.
You can open the calculator as a new tab, it appears in the side panel of Firefox, or open a new Firefox window for it. It keeps a long history of previous operations.
In the menu, you can find numerous constant and fixed values ??as well as frequently used functions. It is notable that it comes with many measuring units that you can quickly manage transitions.
If you want to integrate a calculator into your browser, you must use calculator, you must be impressed.