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[GH-ISSUE #1960] Cruzin' the net with --net=none #1313

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opened 2026-05-05 07:51:04 -06:00 by gitea-mirror · 4 comments

gitea-mirror commented

2026-05-05 07:51:04 -06:00

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Originally created by @charliemb2 on GitHub (May 26, 2018).
Original GitHub issue: https://github.com/netblue30/firejail/issues/1960

This appears to be a bug, and if it's a bug it is the last bug I thought I've have to report.

Here's what I'm seeing; I can cruse the internet fully and without restriction with a Firefox instance started by either:

$ firejail --net=none firefox
$ firejail --noprofile --net=none firefox

The only mitigating factor that I can think of is that I'm also running another instance of firefox unsandboxed by filejail, if that matters.

Versions:

firejail version 0.9.38.10 (installed from Synaptic within Mint to stay as safe as recommended)
Linux Ming 18.3 Sylvia

I didn't see mention of --net=none dysfunction in any other topic

Originally created by @charliemb2 on GitHub (May 26, 2018). Original GitHub issue: https://github.com/netblue30/firejail/issues/1960 This appears to be a bug, and if it's a bug it is the last bug I thought I've have to report. Here's what I'm seeing; I can cruse the internet fully and without restriction with a Firefox instance started by either: - $ firejail --net=none firefox - $ firejail --noprofile --net=none firefox The only mitigating factor that I can think of is that I'm also running another instance of firefox unsandboxed by filejail, if that matters. Versions: - firejail version 0.9.38.10 (installed from Synaptic within Mint to stay as safe as recommended) - Linux Ming 18.3 Sylvia I didn't see mention of --net=none dysfunction in any other topic

gitea-mirror

2026-05-05 07:51:04 -06:00

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gitea-mirror commented

2026-05-05 07:51:10 -06:00

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@reinerh commented on GitHub (May 26, 2018):

The only mitigating factor that I can think of is that I'm also running another instance of firefox unsandboxed by filejail, if that matters.

That's exactly the problem. You are only opening another window of the already running instance.
See also: https://firejail.wordpress.com/support/#firefox

@reinerh commented on GitHub (May 26, 2018): > The only mitigating factor that I can think of is that I'm also running another instance of firefox unsandboxed by filejail, if that matters. That's exactly the problem. You are only opening another window of the already running instance. See also: https://firejail.wordpress.com/support/#firefox

gitea-mirror commented

2026-05-05 07:51:11 -06:00

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@charliemb2 commented on GitHub (May 26, 2018):

Thanks.

Indeed, I see only a single instance of firefox in the system monitor.
I was under the impression that firefox was now sandboxed. It is in Windows and there I see separate processes.

Will "firejail --net=none" start working independently of other firefox instances when firefox becomes sandboxed at some point in Linux?

@charliemb2 commented on GitHub (May 26, 2018): Thanks. Indeed, I see only a single instance of firefox in the system monitor. I was under the impression that firefox was now sandboxed. It is in Windows and there I see separate processes. Will "firejail --net=none" start working independently of other firefox instances when firefox becomes sandboxed at some point in Linux?

gitea-mirror commented

2026-05-05 07:51:12 -06:00

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@SkewedZeppelin commented on GitHub (May 26, 2018):

firejail --private --net=none /usr/bin/firefox --no-remote is what you need if you want to run a new instance while an existing one (sandboxed or not) is running

@SkewedZeppelin commented on GitHub (May 26, 2018): `firejail --private --net=none /usr/bin/firefox --no-remote` is what you need if you want to run a new instance while an existing one (sandboxed or not) is running

gitea-mirror commented

2026-05-05 07:51:14 -06:00

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@charliemb2 commented on GitHub (May 26, 2018):

Thanks SkewedZeppelin - That worked!

@charliemb2 commented on GitHub (May 26, 2018): Thanks SkewedZeppelin - That worked!

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Reference: github-starred/firejail#1313

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