Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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How do I stop DEP closing firefox

cor-el replied
AndreaP

After downloading "Trusteer" as recommended by my online bank, I noticed that everytime I went online via Firefox, after a certain period (not always the same time period - it varies) DEP forced Firefox to close. I have tried to change the DEP settings via: Control Panel/System/System/Properties/Advanced/Performance/Settings/Data Execution Prevention.

I have tried both of the options shown and the problem remains.

After downloading "Trusteer" as recommended by my online bank, I noticed that everytime I went online via Firefox, after a certain period (not always the same time period - it varies) DEP forced Firefox to close. I have tried to change the DEP settings via: Control Panel/System/System/Properties/Advanced/Performance/Settings/Data Execution Prevention. I have tried both of the options shown and the problem remains.

All Replies (2)

It sounds like DEP doesn't like Firefox!

Ensure that you downloaded DEP from the official source and not through a download mirror.

Can you change the settings to allow Firefox full access to the internet and your computer?

Do a malware check with some malware scanning programs on the Windows computer.
Please scan with all programs because each program detects different malware.
All these programs have free versions.

Make sure that you update each program to get the latest version of their databases before doing a scan.

You can also do a check for a rootkit infection with TDSSKiller.

See also:


Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test to see if that helps.