Firstly you know about the browser most people are used two type of browser that is
1) Mozilla Firefox
2)Google Chrome
How to add an extension to the browser?
STEPS
1) Open the chrome web store.
2) Click app or extension.
3) Browser or search for what you like to add.
4) When you find app or extension you like to add, click add to chrome.
5) If you are adding an extension: Review the types of data that an extension will be able to access.
