nssutil3.dll - Analyze and How to Fix Errors

★★★★☆ Verified File (27.08.2026)

⚠️ Important Notice: Discover nssutil3.dll functions and roles in Mozilla Firefox security. Essential for understanding digital certificate management. Manually replacing system libraries can brick future Windows updates or cause critical system failures.

Architecture:	32-bit (x86)	Compatible with 32 and 64-bit Windows
Creation date	08.10.2025 22:43:47
File version	3.39.0.0
Antivirus scan	✅ Clean	No viruses detected.
Digital signature	🟡 Not signed	Signature missing. The file may have been modified.
Hash Integrity	✅ MD5: Verified	File Hash protection is missing.
File size	117.5 kb.	120320 bytes.

Hashes:

MD5: c77973bf666bd79bc0052a40917037d5 ✅
SHA-1: f090135eba1c366a2a40f1deaf4960c291a883e7
SHA-256: cb4e8b4c9458a04531c9b84c665c79d24fbc65824310b424c7c87958c6e96ec5
SHA-512: 81c72294a876dfc3c006dab3ef207afeaed0e3468082c09ff7268de17c0318d4f4f2f2007f0bab7dad6da3e99e5569147c24d7b579e974202a1f3ee45e03e524

✅ This file is compatible with 32-bit Windows and can run on ✅ 64-bit Windows (via the WOW64 subsystem).

To fix the nssutil3.dll error without downloading files from third-party websites, you need to repair the program that uses it. This file is a legitimate component of the Network Security Services library, used heavily by Mozilla Firefox, Thunderbird, and certain video games.

Here are the safest ways to fix it using system tools.

?? Reinstall the Affected Program

Most nssutil3.dll errors happen because a specific app's files got corrupted.

Open the Start Menu and type Control Panel.
Click Uninstall a program under the Programs category.
Find Mozilla Firefox, Thunderbird, or the specific game causing the error.
Click Uninstall.
Download the official installer from the trusted developer website and install it again.

?? Run SFC and DISM Scans

If the file is missing from your Windows system directories, built-in Windows repair tools can restore it.

Right-click the Start Button and select Terminal (Admin) or Command Prompt (Admin).
Type sfc /scannover and press Enter. Wait for it to finish.
Type DISM /Online /Cleanup-Image /RestoreHealth and press Enter.
Restart your computer.

?? Check Your Recycle Bin

Sometimes the file is deleted by accident.

Open your Recycle Bin from the desktop.
Search for nssutil3.dll in the top-right search bar.
If you find it, right-click the file and choose Restore.

?? Update Windows

An outdated operating system can cause compatibility issues with security DLL files.

Open Settings (Press Windows Key + I).
Click on Windows Update.
Click Check for updates and install any available packages.
Restart your system.

To help pinpoint the exact solution, could you tell me which specific program or game shows this error, and when exactly the error pops up?

📊 Diagnostics Tool: Verify Your `nssutil3.dll` File

Worried that the file on your PC has been modified by malware? Drop it into the form below. Our script will verify its file size, cryptographic hash (MD5/SHA-1), and check for a valid Microsoft digital signature.

Connected files:
plc4.dll
├── plds4.dll
├── nspr4.dll
├── MSVCR90.dll
└── KERNEL32.dll
Other versions:
️ nssutil3.dll 3.73.1.0 64-bit (x64)