"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.
Выбранное решение
I've been having the same issue for months. Nothing I found on the issue has worked to get rid of this annoying banner.
So I took the rather drastic measure of completely reinstalling Windows 11, including deletion of all data.
After that I did a fresh install of Firefox and as hoped and expected, the banner was finally gone.
However, the joy didn't last long, because the banner came back. What is going on?!
I think it appeared after I had created a profile. So I deleted the profile again ... but the banner/message remained.
I then tried Natalie's tip from above, to delete the *system/user* variables MOZ_DISABLE_CONTENT_SANDBOX and MOZ_DISABLE_NPAPI_SANDBOX.
So *not* in Firefox, but directly in Windows:
1. Press the Windows key, type "edit the system environment variables". 2. Select the top result to open the "System Properties" window. 3. Click the Environment Variables... button at the bottom. 4. Delete the two entries.
This has now removed the stubborn message in Firefox. Finally! Thank you!
But the question remains: What has set these variables in the first place? I will run a virus-/malware-scan to make sure, theres no unwanted software installed.
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.Rafael. said
I've been having the same issue for months. Nothing I found on the issue has worked to get rid of this annoying banner. So I took the rather drastic measure of completely reinstalling Windows 11, including deletion of all data. After that I did a fresh install of Firefox and as hoped and expected, the banner was finally gone. However, the joy didn't last long, because the banner came back. What is going on?! I think it appeared after I had created a profile. So I deleted the profile again ... but the banner/message remained. I then tried Natalie's tip from above, to delete the *system/user* variables MOZ_DISABLE_CONTENT_SANDBOX and MOZ_DISABLE_NPAPI_SANDBOX. So *not* in Firefox, but directly in Windows: 1. Press the Windows key, type "edit the system environment variables". 2. Select the top result to open the "System Properties" window. 3. Click the Environment Variables... button at the bottom. 4. Delete the two entries. This has now removed the stubborn message in Firefox. Finally! Thank you! But the question remains: What has set these variables in the first place? I will run a virus-/malware-scan to make sure, theres no unwanted software installed.
Fantastic find. This worked perfectly and I no longer have that stupid message bar at the top of my browser window. Thank you.
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