Download Old Version Of Mozilla Firefox 3.6 [VERIFIED]
Scroll down or search the page for the folder named 3.6.28. Why 3.6.28? That was the final security update for the 3.6 branch (released March 13, 2012). Unless you need a specific sub-version for a bug test, always grab the highest point release (3.6.28).
Mozilla’s official FTP/archive historically hosted old builds, but official support for very old versions may be removed or relocated. Use these guidelines:
On Windows 10, you might see: "The application has failed to start because its side-by-side configuration is incorrect."
Fix: Firefox 3.6 requires Visual C++ 2008 Redistributables. Download the official Microsoft VC++ 2008 SP1 package separately, then re-run the Firefox installer.
Some software archives like oldapps.com mirror Mozilla's FTP. Use with caution. Compare the file size and hash against Mozilla’s official list.
Search for "Firefox 3.6" on archive.org. Many users have uploaded ISOs and installers. Because the Internet Archive scans for malware, it is relatively safe.
If you need to access old websites but want security, consider these forks before committing to Firefox 3.6:
Only use true Firefox 3.6 if you are running a sandboxed VM or hardware so old (Pentium 4) that modern forks cannot run.
Scroll down or search the page for the folder named 3.6.28. Why 3.6.28? That was the final security update for the 3.6 branch (released March 13, 2012). Unless you need a specific sub-version for a bug test, always grab the highest point release (3.6.28).
Mozilla’s official FTP/archive historically hosted old builds, but official support for very old versions may be removed or relocated. Use these guidelines:
On Windows 10, you might see: "The application has failed to start because its side-by-side configuration is incorrect."
Fix: Firefox 3.6 requires Visual C++ 2008 Redistributables. Download the official Microsoft VC++ 2008 SP1 package separately, then re-run the Firefox installer.
Some software archives like oldapps.com mirror Mozilla's FTP. Use with caution. Compare the file size and hash against Mozilla’s official list.
Search for "Firefox 3.6" on archive.org. Many users have uploaded ISOs and installers. Because the Internet Archive scans for malware, it is relatively safe.
If you need to access old websites but want security, consider these forks before committing to Firefox 3.6:
Only use true Firefox 3.6 if you are running a sandboxed VM or hardware so old (Pentium 4) that modern forks cannot run.
