So have a look at the step-by-step guide below to proceed.
Download the Firejail on your Linux.
For confirmation, if asked, jot down up the key y and press the enter key again.
After you have downloaded the Firejail file just locate it from the terminal by the command cd~/Downloads.
Install up the file from the package file by running up the command: sudo dpkgifiretools*.deb.
Fill up your password if prompted and then press the enter key.
firejailapp_name for example firejailfirefox command, will run up the Firefox web web app in sandbox mode.
This will restrict that particular app from accessing your directories and files.
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