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Clear all Firefox user information and preferences

Overview​

About this script

This script improves your privacy on Windows.

These changes use Windows system commands to update your settings.

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.

This script uses Batch (batchfile) scripting language.

Not Advised

This script should only be used by advanced users. This script is not recommended for daily use as it breaks important functionality. Do not run it without having backups and system snapshots.

Implementation Details

  • Language: batch

  • Required Privileges: Administrator rights

  • Compatibility: Windows only

  • Reversibility: Some changes may be permanent

Explore Categories​

This action belongs to Clear Firefox history category. This category encompasses a series of scripts aimed at helping users manage and delete their browsing history and related data in Mozilla Firefox. The scripts are designed to target different aspects of user data stored by Firefox, providing users options for maintaining privacy and freeing up... Read more on category page ▶

Apply now​

Choose one of three ways to apply:

  1. Automatically via privacy.sexy: The easiest and safest option.
  2. Manually by downloading: Requires downloading a file.
  3. Manually by copying: Advanced flexibility.

Alternative 1. Apply with Privacy.sexy​

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

Open privacy.sexy

privacy.sexy instructions
  1. Open or download the desktop application
  2. Search for the script name: Clear all Firefox user information and preferences.
  3. Check the script by clicking on the checkbox.
  4. Click on Run button at the bottom of the page.

Alternative 2. Download​

Reversible

This script is reversible, you can restore your changes to the initial/default state. The restore/revert methods provided here can help you fix issues.

If something goes wrong, use the Revert script provided above.

  1. Download the script file by clicking on the button below:

    Download script

  2. Run the script file by clicking on it.

Alternative 3. Copy​

This is for advanced users. Consider automatically applying or downloading the script for simpler way.

  1. Open Command Prompt as administrator.
HELP: Step-by-step guide

  1. Click on Start menu

  2. Type cmd

  3. Right click on Command Prompt select Run as administrator

  4. Click on Yes to run Command Prompt

Animation showing how to open terminal as administrator on Windows 11

  1. Copy the following code:
Code to 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."^""; }"
  1. Right click on command prompt to paste it.
  2. Press Enter to apply remaining code.

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