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This is not the latest version of Mozilla Firefox ESR available.

Mozilla Firefox ESR


Package test results are passing.

This package was approved as a trusted package on 3/8/2017.

Bringing together all kinds of awesomeness to make browsing better for you.


  • Freedom is fast: Go anywhere you want on the Web — with a quickness.
  • Freedom is personal: Enjoy the most built-in privacy tools of any browser.
  • Freedom is yours: people, not profit.


  • Looking for Firefox Developer Edition? Install the firefox-dev package.
  • Looking for Firefox for Personal Use? Install the Firefox package.
  • This package installs Firefox ESR in the first language which matches this list:

    1. Install arguments override parameter if present, e.g. choco install Firefox -packageParameters "l=en-GB".
      To get a list of all available locales have a look at this file:

    2. If Firefox is already installed: the same language as the already installed Firefox.

    3. The Windows system language where the Firefox package gets installed.

    4. If Firefox does not support the system language, it will fall back to “en-US”

To install Mozilla Firefox ESR, run the following command from the command line or from PowerShell:

C:\> choco install firefoxesr --version 52.0

To upgrade Mozilla Firefox ESR, run the following command from the command line or from PowerShell:

C:\> choco upgrade firefoxesr --version 52.0


  • tools\chocolateyInstall.ps1 Show
    $ErrorActionPreference = 'Stop'
    # This is the general install script for Mozilla products (Firefox and Thunderbird).
    # This file must be identical for all Choco packages for Mozilla products in this repository.
    $toolsPath = Split-Path $MyInvocation.MyCommand.Definition
    . $toolsPath\helpers.ps1
    $packageName = 'FirefoxESR'
    $softwareName = 'Mozilla Firefox*ESR'
    $allLocalesListURL = ''
    $alreadyInstalled = (AlreadyInstalled -product $softwareName -version '52.0')
    if (Get-32bitOnlyInstalled -product $softwareName) {
      Write-Output $(
        'Detected the 32-bit version of Firefox on a 64-bit system. ' +
        'This package will continue to install the 32-bit version of Firefox ' +
        'unless the 32-bit version is uninstalled.'
    if ($alreadyInstalled -and ($env:ChocolateyForce -ne $true)) {
      Write-Output $(
        "Firefox is already installed. " +
        'No need to download an re-install again.'
    } else {
      $locale = GetLocale -localeUrl $allLocalesListURL -product $softwareName
      $checksums = GetChecksums -language $locale -checksumFile "$toolsPath\LanguageChecksums"
      $packageArgs = @{
        packageName = $packageName
        fileType = 'exe'
        softwareName = "$softwareName*"
        Checksum = $checksums.Win32
        ChecksumType = 'sha512'
        Url = "${locale}"
        silentArgs = '-ms'
        validExitCodes = @(0)
      if (!(Get-32bitOnlyInstalled($softwareName)) -and (Get-ProcessorBits 64)) {
        $packageArgs.Checksum64 = $checksums.Win64
        $packageArgs.ChecksumType64 = 'sha512'
        $packageArgs.Url64 = "${locale}"
      Install-ChocolateyPackage @packageArgs
  • tools\chocolateyUninstall.ps1 Show
    $ErrorActionPreference = 'Stop';
    $packageName = 'FirefoxESR'
    $uninstalled = $false
    [array]$key = Get-UninstallRegistryKey -SoftwareName 'Mozilla Firefox*ESR*'
    if ($key.Count -eq 1) {
      $key | % {
        $packageArgs = @{
          packageName = $packageName
          fileType    = 'exe'
          silentArgs  = '-ms'
          validExitCodes= @(0)
          file          = "$($_.UninstallString.Trim('"'))"
        Uninstall-ChocolateyPackage @packageArgs
        Write-Warning "Auto Uninstaller may detect Mozilla Maintenance Service."
        Write-Warning "This should not be uninstalled if any other Mozilla product is installed."
    } elseif ($key.Count -eq 0) {
      Write-Warning "$packageName has already been uninstalled by other means."
    } elseif ($key.Count -gt 1) {
      Write-Warning "$($key.Count) matches found!"
      Write-Warning "To prevent accidental data loss, no programs will be uninstalled."
      Write-Warning "Please alert package maintainer the following keys were matched:"
      $key | % {Write-Warning "- $($_.DisplayName)"}
  • tools\helpers.ps1 Show
    function GetUninstallPath() {
        [Parameter(Mandatory = $true)]
      $regUninstallDir = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\'
      $regUninstallDirWow64 = 'HKLM:\SOFTWARE\Wow432Node\Microsoft\Windows\CurrentVersion\Uninstall\'
      $uninstallPaths = $(Get-ChildItem $regUninstallDir).Name
      if (Test-Path $regUninstallDirWow64) {
        $uninstallPaths += $(Get-ChildItem $regUninstallDirWow64).Name
      $uninstallPath = $uninstallPaths -match "$product [\d\.]+ \([^\s]+ [a-zA-Z\-]+\)" | select -first 1
      return $uninstallPath
    function GetLocale {
        [Parameter(Mandatory = $true)]
        [Parameter(Mandatory = $true)]
      $availableLocales = Get-WebContent $localeUrl 2>$null
      $packageParameters = $env:chocolateyPackageParameters
      $packageParameters = if ($packageParameters -ne $null) { $packageParameters } else { "" }
      $argumentMap = ConvertFrom-StringData $packageParameters
      $localeFromPackageParameters = $argumentMap.Item('l')
      $uninstallPath = GetUninstallPath -product $product
      $alreadyInstalledLocale = $uninstallPath -replace ".+\s([a-zA-Z\-]+)\)",'$1'
      $systemLocalizeAndCountry = (Get-Culture).Name
      $systemLocaleTwoLetter = (Get-Culture).TwoLetterISOLanguageName
      $fallbackLocale = 'en-US'
      $locales = $localeFromPackageParameters, $alreadyInstalledLocale, `
        $systemLocalizeAndCountry, $systemLocaleTwoLetter, $fallbackLocale
        foreach ($locale in $locales) {
          $localeMatch = $availableLocales -match "os=win&lang=$locale`"" | select -first 1
          if ($localeMatch -and $locale -ne $null) {
        return $locale
    function AlreadyInstalled() {
        [Parameter(Mandatory = $true)]
        [Parameter(Mandatory = $true)]
      $uninstallEntry = $(
        "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\$product $version*"
      $uninstallEntryWow64 = $(
        "HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\$product $version*"
      if ((Test-Path $uninstallEntry) -or (Test-Path $uninstallEntryWow64)) {
        return $true
      return $false
    function Get-32bitOnlyInstalled() {
        [Parameter(Mandatory = $true)]
      $systemIs64bit = Get-ProcessorBits 64
      if (-Not $systemIs64bit) {
        return $false
      $registryPaths = @(
      $installedVersions = Get-ChildItem $registryPaths | ? { $_.Name -match "$product [\d\.]+ \(x(64|86)" }
      if (
        $installedVersions -match 'x86' `
        -and $installedVersions -notmatch 'x64' `
        -and $systemIs64bit
      ) {
        return $true
    function GetChecksums() {
        [Parameter(Mandatory = $true)]
        [Parameter(Mandatory = $true)]
      Write-Debug "Loading checksums from: $checksumFile"
      $checksumContent = Get-Content $checksumFile
      $checksum32 = ($checksumContent -match "$language\|32") -split '\|' | select -last 1
      $checksum64 = ($checksumContent -match "$language\|64") -split '\|' | select -last 1
      return @{
        "Win32" = $checksum32
        "Win64" = $checksum64
  • tools\LanguageChecksums

Virus Scan Results

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Package Maintainer(s)

Software Author(s)

  • Mozilla


Release Notes

Version History

Version Downloads Last updated Status
Mozilla Firefox 60.8.0 43797 Tuesday, July 9, 2019 approved
Mozilla Firefox 60.7.2 16184 Thursday, June 20, 2019 approved
Mozilla Firefox 60.7.1 4734 Tuesday, June 18, 2019 approved
Mozilla Firefox 60.7.0 18574 Wednesday, May 22, 2019 approved
Mozilla Firefox 60.6.2 14607 Monday, May 6, 2019 approved
Mozilla Firefox 60.6.1 26308 Friday, March 22, 2019 approved
Show More

Discussion for the Mozilla Firefox ESR Package

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  • This discussion is only about Mozilla Firefox ESR and the Mozilla Firefox ESR package. If you have feedback for Chocolatey, please contact the google group.
  • This discussion will carry over multiple versions. If you have a comment about a particular version, please note that in your comments.
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