Mozilla organizes these by operating system and language. After clicking a link below, select your language folder (e.g., en-US for English - United States) to find the installer: (The final update for the 52 ESR series) Windows 32-bit Windows 64-bit Linux 64-bit Firefox 12.0 (Legacy version from 2012)
It served as the final supported Firefox version for Windows XP and Windows Vista users.
Scroll to find the specific version number you need (e.g., 52.9.0esr or 45.0 ). Download Firefox 12-51 52 Esr
These versions are years out of date. They lack modern defenses against malware, phishing, and tracking.
Introduced a responsive, tab-based Preferences menu instead of a pop-up window. Mozilla organizes these by operating system and language
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.
Select your platform directory ( win32 , win64 , mac , or linux-x86_64 ). These versions are years out of date
: Standard releases used for specific legacy add-on compatibility. 🛠️ Step-by-Step Download Guide Follow these steps to navigate the official archive:
: Once installed, immediately go to Options/Preferences > General > Firefox Updates and select "Check for updates but let you choose to install them" to prevent the browser from automatically updating to the latest (incompatible) version.
Since it is a legacy version, you won't find it on the main Firefox download page. To get it, you must use the official Mozilla FTP Archive . : Go to the 52.0esr directory.
Downloading Legacy Firefox Versions: 12 through 51 and 52 ESR While Mozilla recommends using the latest version of Firefox