Where to Download Old Versions of Firefox [Official Links]

Need an older of Firefox for Windows, Linux or Mac? You can get the offline installers from a couple of Mozilla mirror sites. Besides this, you can also get the offline installer for the latest versions from the same sites.

These sites are basically FTP sites. As such, you’ll have to navigate through the correct directories to get the exact version you need. Check end notes for help on how to identify the directory for specific versions.

Stable, Beta and Extended Support Release (ESR) Versions

  1. http://archive.mozilla.org/pub/firefox/releases/
  2. https://ftp.mozilla.org/pub/firefox/releases/
  3. https://download-installer.cdn.mozilla.net/pub/firefox/releases/
  4. http://releases.mozilla.org/pub/firefox/releases/

Nightly Versions

  1. http://archive.mozilla.org/pub/firefox/nightly/
  2. https://ftp.mozilla.org/pub/firefox/nightly/
  3. https://download-installer.cdn.mozilla.net/pub/firefox/nightly/
  4. http://releases.mozilla.org/pub/firefox/nightly/

Developer Edition

  1. http://archive.mozilla.org/pub/devedition/releases/
  2. https://ftp.mozilla.org/pub/devedition/releases/
  3. https://download-installer.cdn.mozilla.net/pub/devedition/releases/
  4. http://releases.mozilla.org/pub/devedition/releases/


  • Directories for the ESR versions have the letters esr appended at the end of their names e.g 78.0esr/
  • Directories for the Beta versions have the letter b appended at the end of their names followed by beta number e.g 89.0b1/
  • Directories for specific platforms (replace version-no# with the Firefox version number you want):
    • For Windows 64-bit (x64) versions use the directory: …/#version-no#/win64/
    • For Windows 32-bit (x86) versions use the directory: …/#version-no#/win32/
    • For Windows AArch64 (ARM64) versions use the directory:…/#version-no#/win64-aarch64/
    • For Linux 64-bit (x64) versions use the directory: …/#version-no#/linux-x86_64/
    • For Linux 32-bit (x86) versions use the directory: …/#version-no#/linux-i686/
    • For the Firefox Snap Package use the directory: …/#version-no#/snap/
    • For Mac versions use the directory: …/#version-no#/mac/
    • For versions without EME (Encyrpted Media Extensions i.e DRM) use the directories with EME-free appended to their name
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  • After navigating into the platform directory open the directory corresponding to the language you want Firefox to use e.g for US English the correct directory is /en-US/, for British English /en-GB/ and for Canadian English /en-CA/. Check here to confirm the code for your preferred lnaguage.


Kelvin Muriuki is a web content developer that's passionate about keeping the internet a useful place. He is the founder and editor of Journey Bytes, a tech blog and web design agency. Feel free to connect with him regarding the content appearing on this page or on web and content development.

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