default-browser-agent.exe - Analyze and How to Fix Errors

⚠️ Important Notice: exe - Automate your browser settings installation effortlessly. 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	01.12.2025 16:48:00
File version	115.31.0.9466
Antivirus scan	✅ Clean	No viruses detected.
Digital signature	✅ Have signed	File have signature, it is original file.
Hash Integrity	✅ MD5: Verified	File Hash protection is missing.
File size	0.6 Mb.	0.6 Mb. bytes.

Hashes:

MD5: 86c6f58f266b94e15330b979a31adf2b ✅
SHA-1: de8e15c8352e34f111757a7a609678bcf6b1f308
SHA-256: f7a7282cf03c47b66de7516d46dd6a44a8d207d6d96318a43cb0b0d92ade1aeb
SHA-512: 4a54024bbf9bd81ddb405b9478fd3f6bbf6865021b24908f8fe8da970a25e67f1360d8ef3fe1b1b1b7e80e7475f7ab070ccfe633e9d68c14c5865b2dacb03077

Digital file signature default-browser-agent.exe ✅

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

To fix the default-browser-agent.exe error without downloading any third-party tools, you need to repair or disable the Firefox Default Browser Agent task. This executable is a legitimate Mozilla background process that tracks default browser settings.

Method 1: Disable the Task in Task Scheduler

The most common cause of this error is a corrupted scheduled task. Disabling it stops the error from popping up.

1. Press Windows Key + R to open the Run dialog box.
2. Type taskschd.msc and press Enter.
3. In the left sidebar, click the arrow next to Task Scheduler Library.
4. Expand Mozilla (or look inside the main library list).
5. Click on the task named default-browser-agent.
6. Right-click the task in the middle pane and select Disable.

Method 2: Repair Mozilla Firefox

If you want to keep the feature but fix the corrupted file, use the built-in Windows repair function.

1. Press Windows Key + I to open Settings.
2. Click on Apps, then select Installed apps (or Apps & features).
3. Scroll down and find Mozilla Firefox.
4. Click the three dots (or click the app) and select Modify or Advanced options.
5. Choose Refresh or Repair if available, or run the Firefox installer if you already have it on your drive to repair the installation.

Method 3: Disable Agent via Firefox Advanced Settings

You can turn off this telemetry agent directly inside the browser configuration.

1. Open Firefox.
2. Type about:config in the address bar and press Enter.
3. Click Accept the Risk and Continue.
4. Search for default-browser-agent.enabled.
5. Double-click the preference to change its value from true to false.

Method 4: Run System File Checker (SFC)

If the error is caused by general Windows system file corruption, use the built-in command-line tool.

1. Press the Windows Key, type cmd, and right-click Command Prompt.
2. Select Run as administrator.
3. Type sfc /scannow and press Enter.
4. Wait for the scan to finish and restart your computer.

---

📊 Diagnostics Tool: Verify Your default-browser-agent.exe 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:
ADVAPI32.dll
├── bcrypt.dll
├── CRYPT32.dll
├── KERNEL32.dll
├── NETAPI32.dll
├── ole32.dll
├── OLEAUT32.dll
├── RPCRT4.dll
├── SHELL32.dll
├── SHLWAPI.dll
├── MSVCP140.dll
├── USER32.dll
├── WININET.dll
├── VCRUNTIME140.dll
├── api-ms-win-crt-runtime-l1-1-0.dll
├── api-ms-win-crt-stdio-l1-1-0.dll
├── api-ms-win-crt-math-l1-1-0.dll
├── api-ms-win-crt-heap-l1-1-0.dll
├── api-ms-win-crt-locale-l1-1-0.dll
├── api-ms-win-crt-time-l1-1-0.dll
├── api-ms-win-crt-filesystem-l1-1-0.dll
├── api-ms-win-crt-string-l1-1-0.dll
└── api-ms-win-crt-convert-l1-1-0.dll

Mozilla Corporation