A simple how to on how to make simple mail "almost" standalone
uses, you might ask?
default email perhaps?
why not just download Thunderbird you might ask, because then what would be the fun in not learning how to do something new...

anyway,
first step is to create the Firefox shortcut on desktop, or in the program files (location listed below) or wherever you put it, this can be done by using the existing shortcut and right click Firefox icon then create shortcut.

Next, you will need to right click the Firefox shortcut you just created and click properties