Firejail is described as 'SUID security sandbox program that reduces the risk of security breaches by restricting the running environment of untrusted applications using Linux namespaces and seccomp-bpf' and is a Virtualization tool in the security & privacy category. There are more than 10 alternatives to Firejail for a variety of platforms, including Windows, Linux, Online / Web-based, Android and Sandboxie. The best alternative is Sandboxie Plus, which is both free and Open Source. Other great apps like Firejail are Windows Sandbox, Shadow Defender, SHADE Sandbox and Cuckoo Sandbox.
The Virtual Environment for secured and comfortable Web Browsing: On the basis of a “Browser-in-the-Box” concept a virtual machine is provided with a reduced operating system and a web browser encapsulated therein.