When acquiring legacy software, sourcing from official channels is paramount to avoid malware, bundled adware, or tampered executables. Mozilla maintains a complete archive of every version ever released.
Introduced the silent update mechanism, native PDF rendering, and preliminary WebGL capabilities. These versions are highly lightweight and ideal for bare-bones automation testing.
Version 52 ESR was the final Firefox release to support NPAPI (Netscape Plugin Application Programming Interface) plugins, excluding Adobe Flash. Technologies like Java, Silverlight, and specific corporate security applets require this specific version to function.
Click the .exe , .dmg , or .tar.bz2 installer link to begin the direct download. System Requirements and OS Compatibility Download Firefox 12-51 52 Esr
Legacy Firefox Versions: Guide to Downloading and Running Firefox 12 to 52 ESR
: Use the browser only for the specific offline task, legacy hardware configuration, or trusted internal website that requires it. Do not use it for daily tasks like online banking or accessing personal email.
Download this specific extended release directly from the Firefox 52.0esr Archive . How to Navigate the Mozilla Archive: Click one of the links above. Scroll and click on your desired version number. These versions are highly lightweight and ideal for
If you absolutely must download one of these versions, you should use official, unmodified binaries from Mozilla's archives to avoid malware, adware, or spyware.
: Keep your modern, secure browser (like the latest Firefox or Chrome release) as your default browser for standard web surfing.
Notes up front:
Downloading outdated software carries inherent security risks. Third-party mirror websites frequently bundle old browsers with malware, adware, or tracking cookies. Always pull files directly from official repositories.
This is the most common reason. Modern browsers have dropped support for outdated operating systems. For users who, for various reasons, still need to operate a computer running Windows XP or Windows Vista, .