How To Block Internet Access For Specific Program on Linux

Here is how to block internet access for a specific program on Linux easily without making permanent changes.
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Links:
Github: github.com/net...
Install Commands: Ubuntu PPA
sudo add-apt-repository ppa:deki/firejail
sudo apt-get update
sudo apt-get install firejail firejail-profiles
Arch: sudo pacman -Sy firejail
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