"Security Sandbox is disabled" pop up under toolbar
I recently opened Firefox to see a new flagged warning under my toolbar that says "The security sandbox is disabled. Your configuration is unsupported and less secure."
I have gone into about:config and adjusted every security.sandbox element to see if that would change anything; it did not.
I am running on Windows 11 Home so I cannot install or properly run Windows Sandbox.
I would either like a solution to enable the sandbox once again, or just remove the notification from the toolbar.
All Replies (13)
Check value of security.sandbox.content.level in about:config and also existence of MOZ_DISABLE_CONTENT_SANDBOX environmental variable.
Currently, my security.sandbox.content.level is set to 8, I have tried all the numbers between 0-8 to no success. How do I check for and edit an environmental variable?
I came here because I have been searching for the past day. There is no clear guide on how to edit an environmental variable for Firefox that works for me.
Go to cmd.exe and type in
echo %MOZ_DISABLE_CONTENT_SANDBOX%
If there's no number in answer, the reason of this issue is unknown to me.
It is currently set to 1. Sorry for one final question but how do I set it to zero...
Perhaps it's in the OS level, not in USER level. You'll need administrator rights.
- Press Win + R, type sysdm.cpl, press Enter.
- Go to the Advanced tab.
- Click Environment Variables….
- In the System variables section:
- Select the variable.
- Click Edit….
- Change the value and click OK.
Okay, I have gone to sysdm.cpl and the variables MOZ_DISABLE_CONTENT_SANDBOX and MOZ_DISABLE_NPAPI_SANDBOX were set to 0 for my account but not on the system. These variables were not in the System variables whatsoever. I created two new variables named MOZ_DISABLE_CONTENT_SANDBOX and MOZ_DISABLE_NPAPI_SANDBOX and set them to 0 in System variables but this has still not solved my problem.
I've restarted it and all the "DISABLE" variables are set to zero. The warning is still there. Is there anyway to dismiss it? I can troubleshoot this later, but I at least want the banner to go away.
All I know about this banner is: it shows up when MOZ_DISABLE_CONTENT_SANDBOX=1 or the pref security.sandbox.content.level == 0 and it's non-dismissable. Please read bug 1967907.
Some tests are using this:
Services.env.set("MOZ_DISABLE_CONTENT_SANDBOX", "");
so you could try "" instead of 0.
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