To download specific older versions of Firefox, including the Extended Support Release (ESR) versions like 52, you should use the official Mozilla FTP Archive Official Download Links
You can find the direct installers for the versions you requested here: Firefox 52.9.0 ESR (Final v52 Release):
This is the last version to support Windows XP and Vista and the NPAPI plugins (like Java and Silverlight). Windows (64-bit) Installer Windows (32-bit) Installer Firefox 12 - 51 (Standard Releases): These are accessible through the release index. Index of All Firefox Releases Key Version Features Firefox 52 ESR: Notable for being the last version to support the NPAPI plugin
architecture (Netscape Plugin API), which was required for older web-based tools like mydlink portal or legacy enterprise Java apps. Legacy Support: Firefox 52.9.0esr was the final release for Windows XP Windows Vista Important Security Warning recommends against
using older versions of Firefox for daily browsing because they lack modern security patches. If you need an older version for a specific legacy tool, it is safest to use a Portable Edition that runs separately from your main browser. Mozilla Support Mozilla Firefox ESR, Portable Edition like Java, or to use on an older operating system
Why mydlink portal is not working with Firefox 52 | D-Link UK
Guide to Downloading Legacy Firefox Versions: 12-51 and 52 ESR
If you are looking to download older versions of Firefox, specifically versions 12 through 51 52 Extended Support Release (ESR)
, you are likely doing so for compatibility with legacy hardware, specific web development testing, or to maintain support for older operating systems like Windows XP or Vista Why Version 52 ESR is Significant
Firefox 52.9.0 ESR was the final version of Firefox to support Windows XP and Windows Vista . It was also the last version to support legacy NPAPI plugins Download Firefox 12-51 52 Esr
(like Silverlight or Java), making it a vital "bridge" version for users running older enterprise software. Where to Safely Download Legacy Versions
Mozilla maintains a comprehensive archive of every version ever released. To ensure your system remains secure, only download from the official Mozilla servers. Mozilla FTP Archive (All Releases):
You can find every version from 12.0 to 51.0 in the official directory. Visit the Mozilla Release Archive Firefox 52.9.0 ESR (Final XP/Vista Version):
This specific version is found in the ESR sub-directory of the archive. Download Firefox 52.9.0 ESR How to Install Older Versions Choose the version folder you need (e.g., 52.9.0esr/ Select your operating system folder ( linux-x86_64 Select your preferred language (e.g., Download and run the installer. Important Considerations and Risks Security Vulnerabilities:
Legacy versions do not receive security updates. Browsing the modern web on these versions exposes you to significant risks, as newer exploits are not patched in older codebases. Profile Compatibility:
Modern Firefox profiles are often incompatible with older versions. If you plan to run an old version alongside a new one, it is highly recommended to create a separate profile Automatic Updates:
Once installed, Firefox will immediately try to update itself to the newest version. To prevent this, go to Options/Preferences > General > Firefox Updates
and select "Check for updates but let you choose whether to install them."
For daily browsing, it is always recommended to use the latest stable version of to ensure your data and privacy are protected. run multiple versions of Firefox simultaneously using the Profile Manager? To download specific older versions of Firefox, including
If you are looking for specific older versions of Firefox (v12 through v51) or the 52 ESR (Extended Support Release), you can find them through Mozilla’s official archive. These versions are often used for legacy software compatibility or for systems that require the NPAPI plugin (like Java or Silverlight), which was discontinued in newer versions. Direct Download Links (Mozilla Archive)
Firefox 52.9.0 ESR (Final Version): This was the last version to support NPAPI plugins and Windows XP/Vista. Windows (32-bit) Windows (64-bit) macOS
Legacy Releases (v12 – v51): You can browse the full directory of every version ever released on the Mozilla FTP Archive. Key Version Differences Version Range Key Features / Support v12 – v51
Standard rapid-release versions. Note that v51 was the last version before the major transition in v52. v52 ESR
The "Extended Support Release." Crucial for legacy web apps because it maintained Java and Silverlight support until 2018. ⚠️ Security Warning
Using these versions for daily web browsing is highly discouraged. They do not receive modern security patches and are vulnerable to exploits.
If you need a modern stable version for a newer OS, download the latest Firefox ESR or the standard browser from Mozilla's homepage.
If you are on Windows 7, 8, or 8.1, you should use Firefox 115 ESR, which will receive security updates until at least August 2026.
Are you downloading this for legacy plugin support (like Java) or for use on an older operating system? How to Safely Download Firefox 12-51 52 ESR
Warning: These versions have unpatched security vulnerabilities. Only download them for air-gapped machines, virtual machines, or specific legacy tasks. Do not use them for online banking or logging into modern social media.
Mozilla does not host these old versions on their main website (mozilla.org). They use a dedicated archive. Here is the safe method to download.
Searching for "Firefox 12-51 52 ESR" actually covers two distinct eras of Firefox history.
This is expected. Modern HTTPS standards (TLS 1.3) and certificate authorities often reject Firefox 12-51. You can try enabling older TLS versions in about:config (security.tls.version.enable-deprecated), but this is a security risk.
Mozilla's Official FTP Archive (Deprecated)
Mozilla previously maintained an FTP server (ftp.mozilla.org) with all older releases, but this was shut down in 2023. You can still access an unofficial mirror or use the Internet Archive's Wayback Machine.
Mozilla's Official Directory (Still Partially Accessible)
https://archive.mozilla.org/pub/firefox/releases/Specifically for Firefox 52 ESR
/pub/firefox/releases/52.9.0esr/ (final 52 ESR update)Do not use these versions for everyday browsing – they have unpatched critical security vulnerabilities. Use them only for:
In the directory, you will see a list of folders. Look for:
12.0/51.0/52.0/ or 52.9.0/Select your language (e.g., en-US). Download the installer file ending in .exe (for Windows) or .dmg (for Mac).
Direct Download Examples (for reference):
archive.mozilla.org/pub/firefox/releases/52.9.0esr/win32/en-US/Firefox%20Setup%2052.9.0esr.exearchive.mozilla.org/pub/firefox/releases/12.0/win32/en-US/Firefox%20Setup%2012.0.exe