Clear all Firefox user information and preferences

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Works with Windows 10 and 11Works with Windows Vista, XP, 7, 8, 10, 11, and Windows Server 2008 or newer.

• Windows onlyThis script improves your privacy on Windows
• Single actionThis page belongs to a script, containing basic changes to achieve a task.
• Impact: High

  System Functionality / Data Loss Risk: High

  This action improves privacy with high impact when you run the recommended script.

• Batch (batchfile)These changes use Windows system commands to update your settings.
• Administrator rights requiredThis script requires privilege access to do the system changes
• Fully reversible

  You can fully restore this action (revert back to the original behavior) using this website.

  The restore/revert methods provided here can help you fix issues.

Overview

This script performs a reset of Mozilla Firefox, erasing all user profiles, settings, and personalized data to restore the browser to its default state.

Firefox user profiles, encompassing bookmarks, browsing history, passwords, extensions, themes, and preferences ¹. These folders are in:

• C:\Documents and Settings\<Windows login/user name>\Application Data\Mozilla\Firefox\Profiles\<profile folder> on Windows XP and earlier ¹,
• %APPDATA%\Mozilla\Firefox\Profiles\<profile folder> on Windows 10 and later ¹.

Caution

• Using this script results in a total loss of all personalized Firefox data.
• If your goal is solely to clear browsing data while retaining settings and extensions, this script is not recommended.
• Close Firefox before running this script to prevent potential issues.

Not Advised

This script should only be used by advanced users.

This script is not recommended for daily use as it breaks important functionality.

Consider creating a system restore point before doing any changes.

Sources

PrivacyLearn.com maintains strict sourcing standards for accuracy, integrity and up-to-date content. Our content relies on authoritative sources including vendor documentation, industry standards, and verified research. Learn more about our verification process and quality standards in our editorial standards page.

• Profile folder - Firefox - MozillaZine Knowledge Base. kb.mozillazine.org. (2023).
  Original: https://kb.mozillazine.org/Profile_folder_-_Firefox
  Archived: https://web.archive.org/web/20231101125909/https://kb.mozillazine.org/Profile_folder_-_Firefox#Windows

Apply Now

Choose one of three ways to apply:

Download script

Download and run the script directly

• No app needed
• Offline usage
• Easy-to-apply
• Free
• Open-source

Apply protection

Help

How to apply or restore "Clear all Firefox user information and preferences" using script

• ≈ 2 min to complete
• Tools: Web Browser
• Difficulty: Simple
• ≈ 5 instructions

1. 1

   Download

   Download the script file by clicking on the   Apply protection  button above.
   Use   Undo protection button above to restore changes.
2. 2

   Keep the file

   If warned by your browser, keep the file.
3. 3

   Open

   Open the downloaded file.
4. 4

   Exit

   Once it's done, press any key to exit the window.
5. 5

   Restart

   Restart your computer for all changes to take effect.

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Guided, automated application with safety checks

• Recommended for most users
• Includes safety checks
• Free
• Open-source
• Popular
• Offline/Online usage

Open privacy.sexy

Help

How to apply or restore "Clear all Firefox user information and preferences" using privacy.sexy

• ≈ 3 min to complete
• Tools: privacy.sexy
• Difficulty: Simple
• ≈ 4 instructions

privacy.sexy is free and open-source application that lets securely apply this action easily with more advanced options.

1. 1

   Open or download

   Open or download the desktop application
2. 2

   Choose script

   1. Search for the script name: Clear all Firefox user information and preferences
   2. Check the script by clicking on the checkbox.
3. 3

   Run

   Click on ▶️ Run button at the bottom of the page.

   This button only appears on desktop version (recommended). On browser, use 💾 Save button.

Run commands

Copy and run commands manually Requires technical knowledge

Apply

Apply changes

:: Clear directory contents  : "%LOCALAPPDATA%\Mozilla\Firefox\Profiles"
PowerShell -ExecutionPolicy Unrestricted -Command "$pathGlobPattern = "^""$($directoryGlob = '%LOCALAPPDATA%\Mozilla\Firefox\Profiles'; if ($directoryGlob.EndsWith('\*')) { $directoryGlob } elseif ($directoryGlob.EndsWith('\')) { "^""$($directoryGlob)*"^"" } else { "^""$($directoryGlob)\*"^"" } )"^""; $expandedPath = [System.Environment]::ExpandEnvironmentVariables($pathGlobPattern); Write-Host "^""Searching for items matching pattern: `"^""$($expandedPath)`"^""."^""; $deletedCount = 0; $failedCount = 0; $foundAbsolutePaths = @(); Write-Host 'Iterating files and directories recursively.'; try { $foundAbsolutePaths += @(; Get-ChildItem -Path $expandedPath -Force -Recurse -ErrorAction Stop | Select-Object -ExpandProperty FullName; ); } catch [System.Management.Automation.ItemNotFoundException] { <# Swallow, do not run `Test-Path` before, it's unreliable for globs requiring extra permissions #>; }; try { $foundAbsolutePaths += @(; Get-Item -Path $expandedPath -ErrorAction Stop | Select-Object -ExpandProperty FullName; ); } catch [System.Management.Automation.ItemNotFoundException] { <# Swallow, do not run `Test-Path` before, it's unreliable for globs requiring extra permissions #>; }; $foundAbsolutePaths = $foundAbsolutePaths | Select-Object -Unique | Sort-Object -Property { $_.Length } -Descending; if (!$foundAbsolutePaths) { Write-Host 'Skipping, no items available.'; exit 0; }; Write-Host "^""Initiating processing of $($foundAbsolutePaths.Count) items from `"^""$expandedPath`"^""."^""; foreach ($path in $foundAbsolutePaths) { if (-not (Test-Path $path)) { <# Re-check existence as prior deletions might remove subsequent items (e.g., subdirectories). #>; Write-Host "^""Successfully deleted: $($path) (already deleted)."^""; $deletedCount++; continue; }; try { Remove-Item -Path $path -Force -Recurse -ErrorAction Stop; $deletedCount++; Write-Host "^""Successfully deleted: $($path)"^""; } catch { $failedCount++; Write-Warning "^""Unable to delete $($path): $_"^""; }; }; Write-Host "^""Successfully deleted $($deletedCount) items."^""; if ($failedCount -gt 0) { Write-Warning "^""Failed to delete $($failedCount) items."^""; }"
:: Clear directory contents  : "%APPDATA%\Mozilla\Firefox\Profiles"
PowerShell -ExecutionPolicy Unrestricted -Command "$pathGlobPattern = "^""$($directoryGlob = '%APPDATA%\Mozilla\Firefox\Profiles'; if ($directoryGlob.EndsWith('\*')) { $directoryGlob } elseif ($directoryGlob.EndsWith('\')) { "^""$($directoryGlob)*"^"" } else { "^""$($directoryGlob)\*"^"" } )"^""; $expandedPath = [System.Environment]::ExpandEnvironmentVariables($pathGlobPattern); Write-Host "^""Searching for items matching pattern: `"^""$($expandedPath)`"^""."^""; $deletedCount = 0; $failedCount = 0; $foundAbsolutePaths = @(); Write-Host 'Iterating files and directories recursively.'; try { $foundAbsolutePaths += @(; Get-ChildItem -Path $expandedPath -Force -Recurse -ErrorAction Stop | Select-Object -ExpandProperty FullName; ); } catch [System.Management.Automation.ItemNotFoundException] { <# Swallow, do not run `Test-Path` before, it's unreliable for globs requiring extra permissions #>; }; try { $foundAbsolutePaths += @(; Get-Item -Path $expandedPath -ErrorAction Stop | Select-Object -ExpandProperty FullName; ); } catch [System.Management.Automation.ItemNotFoundException] { <# Swallow, do not run `Test-Path` before, it's unreliable for globs requiring extra permissions #>; }; $foundAbsolutePaths = $foundAbsolutePaths | Select-Object -Unique | Sort-Object -Property { $_.Length } -Descending; if (!$foundAbsolutePaths) { Write-Host 'Skipping, no items available.'; exit 0; }; Write-Host "^""Initiating processing of $($foundAbsolutePaths.Count) items from `"^""$expandedPath`"^""."^""; foreach ($path in $foundAbsolutePaths) { if (-not (Test-Path $path)) { <# Re-check existence as prior deletions might remove subsequent items (e.g., subdirectories). #>; Write-Host "^""Successfully deleted: $($path) (already deleted)."^""; $deletedCount++; continue; }; try { Remove-Item -Path $path -Force -Recurse -ErrorAction Stop; $deletedCount++; Write-Host "^""Successfully deleted: $($path)"^""; } catch { $failedCount++; Write-Warning "^""Unable to delete $($path): $_"^""; }; }; Write-Host "^""Successfully deleted $($deletedCount) items."^""; if ($failedCount -gt 0) { Write-Warning "^""Failed to delete $($failedCount) items."^""; }"
:: Clear directory contents  : "%LOCALAPPDATA%\Packages\Mozilla.Firefox_n80bbvh6b1yt2\LocalCache\Roaming\Mozilla\Firefox\Profiles"
PowerShell -ExecutionPolicy Unrestricted -Command "$pathGlobPattern = "^""$($directoryGlob = '%LOCALAPPDATA%\Packages\Mozilla.Firefox_n80bbvh6b1yt2\LocalCache\Roaming\Mozilla\Firefox\Profiles'; if ($directoryGlob.EndsWith('\*')) { $directoryGlob } elseif ($directoryGlob.EndsWith('\')) { "^""$($directoryGlob)*"^"" } else { "^""$($directoryGlob)\*"^"" } )"^""; $expandedPath = [System.Environment]::ExpandEnvironmentVariables($pathGlobPattern); Write-Host "^""Searching for items matching pattern: `"^""$($expandedPath)`"^""."^""; $deletedCount = 0; $failedCount = 0; $foundAbsolutePaths = @(); Write-Host 'Iterating files and directories recursively.'; try { $foundAbsolutePaths += @(; Get-ChildItem -Path $expandedPath -Force -Recurse -ErrorAction Stop | Select-Object -ExpandProperty FullName; ); } catch [System.Management.Automation.ItemNotFoundException] { <# Swallow, do not run `Test-Path` before, it's unreliable for globs requiring extra permissions #>; }; try { $foundAbsolutePaths += @(; Get-Item -Path $expandedPath -ErrorAction Stop | Select-Object -ExpandProperty FullName; ); } catch [System.Management.Automation.ItemNotFoundException] { <# Swallow, do not run `Test-Path` before, it's unreliable for globs requiring extra permissions #>; }; $foundAbsolutePaths = $foundAbsolutePaths | Select-Object -Unique | Sort-Object -Property { $_.Length } -Descending; if (!$foundAbsolutePaths) { Write-Host 'Skipping, no items available.'; exit 0; }; Write-Host "^""Initiating processing of $($foundAbsolutePaths.Count) items from `"^""$expandedPath`"^""."^""; foreach ($path in $foundAbsolutePaths) { if (-not (Test-Path $path)) { <# Re-check existence as prior deletions might remove subsequent items (e.g., subdirectories). #>; Write-Host "^""Successfully deleted: $($path) (already deleted)."^""; $deletedCount++; continue; }; try { Remove-Item -Path $path -Force -Recurse -ErrorAction Stop; $deletedCount++; Write-Host "^""Successfully deleted: $($path)"^""; } catch { $failedCount++; Write-Warning "^""Unable to delete $($path): $_"^""; }; }; Write-Host "^""Successfully deleted $($deletedCount) items."^""; if ($failedCount -gt 0) { Write-Warning "^""Failed to delete $($failedCount) items."^""; }"

Revert

Restore changes

IiI=

Help

How to apply or restore "Clear all Firefox user information and preferences" using commands

• ≈ 2 min to complete
• Tools: Command Prompt
• Difficulty: Medium
• ≈ 3 instructions

View step-by-step guide with screenshots

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1. 1

   Open Command Prompt

   Open Command Prompt as Administrator.
2. 2

   Copy code

   Copy the code:

   Copy Apply Code Copy Revert Code
3. 3

   Paste & run

   Paste the commands into Command Prompt and press Enter to run.

   Some changes require a system restart to take effect

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• 

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About Us

Reviewed By

This guide has undergone comprehensive auditing and peer review:

• Expert review by undergroundwires

  • Verified technical accuracy and editorial standards
  • Assessed system impact and user privacy risks

• Public review by large community

  • Privacy enthusiasts and professionals peer-reviewed
  • Millions of end-users tested across different environments

History

We continually monitor our guides, their impact and all other privacy options. We update our guides when new information becomes available. On every update, we publicly store who made the change, what has been changed, why the change was made and when the change was made.

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