How to Use Google Translate Add-on in Firefox?

How to use Google translate Add-on to translate words, phrases into multiple languages in firefox?

Google Translate : Easy Translation of Words, Phrases into Multiple Languages

Google Translate is an online tool that allows you to instantly translate words, phrases or any webpages into multiple languages as required. The tool is provided by the search gaint Google. As of July 2016, Google Translate supports 103 languages at various levels and serves over 200 million people daily. Here is a short tutorial on how to use the Google Translate in Firefox web browser.
How To Use Google Translate In Firefox
How to install google translate add-on in Firefox?
How to use google translate add-on?
How to remove / uninstall google translate add-on from Firefox?