how to disable the back button of all browsers using javascript

In this javascript web programming tutorial we will learn how to disable the back button of all browsers or how to prevent the user to go back in all browsers. This code works for all web browsers such as Google Chrome, Opera, Safari, Internet Explorer etc.

Also this code will work in other browsers but in case of FireFox it will not work

So now let's have a look over javascript code that will disable the back button and prevent user to go back in Firefox and in all other browsers