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Edge crash dump, Fiddler, Process Monitor log

This action plan is for troubleshooting the Edge crash issue caused by a web application.

Clone recipe


  1. Download Fiddler from and install it.

  2. Open Fiddler and go to Tools -> Options -> HTTPS tab. Enable Decrypt HTTPS traffic. You will be prompted to install the Fiddler Root certificate (this step requires elevated permission).

  3. Close Fiddler.

  4. Download and unzip Process Monitor from

  5. Search for environment in Windows and open Edit the system environment variables and click the Environment Variables... button to open the editing page.

  6. Create a new user variable as follows:

    Variable name: ENABLE_HEAP_DUMPS

    Variable value: 1

  7. The setting will only take effect after you close all existing Edge processes (msedge.exe) and start a new Edge window.

  8. Access edge://settings/system in Edge and disable Startup boost.

  9. If the setting is greyed out, please launch a CMD or PowerShell window as administrator and execute following command:

    REG ADD "HKLM\SOFTWARE\Policies\Microsoft\Edge" /v StartupBoostEnabled /t REG_DWORD /d 0 /f

Main steps

  1. Press Ctrl + Shift + Del in Edge or access edge://settings/clearBrowserData.

    • Select All time as the Time range.
    • Check Cookies and other site data and Cached images and files.
    • Click Clear now and wait until the clear action completed.

  2. Close all instances of Edge. Open the Task Manager and check the process list in the Details tab. Sort the processes by Name. Ensure that you do not see any msedge.exe process in the list. If there is any remaining msedge.exe process, kill it.

  3. Start Fiddler. It should automatically start capturing, and you will see Capturing icon in the lower left corner. If it is not capturing, press F12 to start capturing.

  4. Launch Procmon.exe as administrator from the location where you unzipped the Process Monitor. It should automatically start capturing after startup. Proceed to the next step when you see that it is generating a large number of events.

  5. Press Win key + R or right click the Start Menu and choose Run to launch a Run dialog and run the command: msedge.exe <URL> to open Edge with a specific URL. For example, to launch Edge to access, you can run msedge.exe

  6. Take whatever steps to reproduce the crash issue.

End steps

  1. After Edge crashes, please proceed to the next step.

  2. Go to Process Monitor, press Ctrl+E or click the third Capture icon to stop capturing.

  3. Click File -> Save. Choose All events and then save the log in pml format.

  4. Go to Fiddler -> File -> Save -> All Sessions... to save the file in saz format.

  5. Check if any Edge crash dumps have been created at %LOCALAPPDATA%\Microsoft\Edge\User Data\Crashpad\reports, you may zip the entire reports folder to reduce the dump file size.

    Note: for other channels, the dump location will be %LOCALAPPDATA%\Microsoft\Edge <channel>\User Data\Crashpad\reports, where <channel> is SxS (Canary), Dev or Beta.

  6. Since full crash dumps take up a lot of disk space, it is suggested to remove the user variable: ENABLE_HEAP_DUMPS if full crash dumps are no longer needed.

  7. Navigate to the edge://policy page in Edge. Click the Reload Policies button. Click the Export to JSON button to save the policies.json.

  8. Navigate to the edge://version/?show-variations-cmd page in Edge. Press Ctrl+S or right click the page and click Save as to save the page in HTML format.

  9. If you want to re-enable Startup boost, you can enable it from edge://settings/system page.

  10. If the setting is greyed out, please open Registry Editor as administrator and find if any of the following registry keys is set to 0.

    • HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge\StartupBoostEnabled
    • HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Edge\StartupBoostEnabled

    If either of these keys is present, remove them to allow you manually toggle the setting in the edge://setting/system page. Alternatively, you can set the value to 1 to enable Startup boost.

    Note: If both keys are present, the one in HKEY_LOCAL_MACHINE takes precedence.