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SPECIFICTION
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Firejail

firejail.wordpress.com

Free plan LinuxSelf-hosted
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Spec score 7.7 #11 of 26 in Sandbox Software

What it is

Firejail is a free, self-hosted Linux sandboxing program for restricting untrusted applications, servers, graphical programs, and login sessions. It uses Linux namespaces and seccomp-bpf so sandboxed processes receive private views of network, process, and mount tables. The software runs on Linux computers with a 3.x kernel or newer. Security controls include protocol filtering, noroot user namespaces, Linux capabilities, D-BUS filtering, and optional AppArmor or SELinux support. Mandatory Access Control can block more than 1,000 desktop applications from passwords, encryption keys, and private data, with more than 1,000 profiles available in /etc/firejail. Firejail can create an isolated TCP/IP stack with routing, firewall, and interfaces, and nettrace can inspect traffic. AppImage packages are supported. Firetools adds a Qt5 graphical launcher, tray integration, editing, management, and statistics; FDNS provides DNS-over-HTTPS through non-logging providers. Running sudo firecfg integrates application menus and file-manager launches. The project targets home users and Linux beginners rather than enterprise customers.

Spec sheet

Support
The project directs support questions to its GitHub wiki and asks users to report security bugs by email.Read 30 Sep 2026 · firejail.wordpress.com
Access control
Mandatory Access Control blocks access to passwords, encryption keys, and private data for more than 1000 desktop applications.Read 30 Sep 2026 · firejail.wordpress.com
AppImage support
Firejail natively supports AppImage packages through the --appimage option.Read 30 Sep 2026 · firejail.wordpress.com
Application coverage
Firejail can sandbox servers, graphical applications, and user login sessions.Read 30 Sep 2026 · firejail.wordpress.com
Desktop integration
Running sudo firecfg integrates Firejail with application menus and file-manager launches.Read 30 Sep 2026 · firejail.wordpress.com
DNS companion
FDNS is a DNS-over-HTTPS proxy that uses DoH services from non-logging providers.Read 30 Sep 2026 · firejail.wordpress.com
GUI companion
Firetools is a Qt5 graphical interface providing a sandbox launcher, system-tray integration, editing, management, and statistics.Read 30 Sep 2026 · firejail.wordpress.com
Kernel support
The software runs on Linux computers with a 3.x kernel version or newer.Read 30 Sep 2026 · firejail.wordpress.com
Network isolation
Firejail can create an isolated TCP/IP stack with its own routing table, firewall, and interfaces.Read 30 Sep 2026 · firejail.wordpress.com
Network monitoring
The software can inspect network traffic with its nettrace feature for analyzing and monitoring application behavior.Read 30 Sep 2026 · firejail.wordpress.com
Process isolation
Sandboxed processes receive private views of shared kernel resources including the network, process, and mount tables.Read 30 Sep 2026 · firejail.wordpress.com
Sandboxing
Firejail is a SUID program that restricts untrusted applications using Linux namespaces and seccomp-bpf.Read 30 Sep 2026 · firejail.wordpress.com
Security controls
Security filters include seccomp-bpf, communication protocol filtering, noroot user namespaces, Linux capabilities, D-BUS filtering, and optional AppArmor or SELinux support.Read 30 Sep 2026 · firejail.wordpress.com
Security profiles
More than 1000 application profiles are available by default in /etc/firejail.Read 30 Sep 2026 · firejail.wordpress.com
Target users
The project identifies home users and Linux beginners as its target market and describes Firejail as a consumer product rather than an enterprise product.Read 30 Sep 2026 · firejail.wordpress.com

Plans and prices

Firejail community project Free Linux desktop focus · GPL v2 · no commercial goals Read 30 Sep 2026 · firejail.wordpress.com

Every Firejail plan and price →

Strong points and limits

Strong points

  • Free GPL v2 community project
  • Linux namespace and seccomp isolation
  • More than 1,000 application profiles
  • Network stack isolation and monitoring
  • AppImage support

Limits

  • Linux-only with 3.x kernel requirement
  • Project targets consumers, not enterprises
  • Self-hosted deployment required
  • Security configuration is user-managed

Who it suits

It suits home users and Linux beginners who need local application isolation, network controls, and optional graphical management on Linux.

Verdict

Firejail offers extensive Linux sandbox controls, profiles, and network isolation at no listed cost. Its Linux-only, self-hosted focus and consumer orientation make platform and deployment fit important.

Where Specifiction places it

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