This tutorial is all about how to configure,secure and optimize Firefox browser.What you have to do is to just open your firefox browser and in URL type below commands.It is possible to configure your browser to work according to your need and requirements.
This is a list of “about” pages for your convenience.
Some of them might be confusing. Some are for diagnostic purposes only. And some are omitted because they require query strings.
Note: about:config is used to configure your browser settings. Like optimes your browser for faster network coonectivity,remember passwords,cache memory,cookies and many more.
So about:config must be used carefully.If you are not aware of what you are doing please dont do it.