Go to the Firefox releases directory path: pub/firefox/releases/52.9.0esr/ . Select your operating system platform: (For 32-bit Windows XP, Vista, 7, 8, 10) win64/ (For 64-bit Windows systems) mac/ (For Apple macOS) linux-x86_64/ (For 64-bit Linux distributions)
Using 52.9.0 ESR on the modern web is risky. Many websites will not load correctly due to outdated security certificates, and the browser itself is vulnerable to modern exploits.
Click on the installer link (e.g., Firefox Setup 52.9.0esr.exe ) to begin the download. Critical Use Cases for This Release
It was one of the last versions to support NPAPI plugins (like Silverlight or older versions of Java) that modern browsers have since blocked.
Firefox version 52.9. 0 ESR was the last supported release for Windows XP and Windows Vista. Mozilla Support firefox version 52.9. 0 esr download
Using outdated software like Firefox 52.9.0 ESR might expose you to security risks, as it will not receive updates. If possible, use the latest versions of Firefox or the current ESR version for better security and features.
Note: The official 64-bit build is only supported on Windows 7 and higher, so 32-bit is recommended for XP/Vista. How to Install and Secure Your Browser the .exe file from the link above.
You're looking for information on downloading Firefox version 52.9.0 ESR.
Running a browser from 2018 in the current digital landscape requires specific configuration tweaks to prevent automated updates and maintain functionality. Disabling Automatic Updates Click on the installer link (e
Firefox Quantum (version 57) introduced a multi-process architecture that was faster but broke compatibility. Version 52.9.0 is the last "classic" Firefox in terms of internal architecture.
Scroll through the alphabetical list of language codes. For US English, select the en-US/ folder. For British English, select en-GB/ .
: It is the final official mechanism for running legacy NPAPI plugins like Java , Silverlight , and Adobe Flash (32-bit version only).
Using Firefox 52.9.0 ESR in 2026 comes with significant security risks. Because this browser has not received security updates since June 2018, it is vulnerable to many known exploits. 0 ESR was the last supported release for
It contains numerous known security vulnerabilities (CVEs) that malicious websites can exploit to execute arbitrary code on your machine.
If you are running into specific errors during your setup, let me know the you are seeing, your specific Service Pack version , and what type of web pages you need to access. I can provide customized troubleshooting steps or recommend modern community-supported browser forks designed for older hardware! Share public link
Choose the installer based on your operating system and preferred language: Windows (32-bit): English (US) All Languages Windows (64-bit): English (US) All Languages Mac (macOS): English (US) All Languages Linux (64-bit): English (US) All Languages 🛠️ Installation Guide