Downloading an old version of Mozilla Firefox 3.6 is not like installing Spotify. You are installing software with unpatched zero-day vulnerabilities.
Our recommendation: Install this inside a Virtual Machine (VirtualBox or VMware) without any personal data. Do not log into banking or email. download old version of mozilla firefox 3.6
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). Downloading an old version of Mozilla Firefox 3
Inside 3.6/, you will see folders like:
Which one should you choose?
Before we show you where to download the file, let’s address the "why." Understanding your use case ensures you are downloading the right version (3.6.0, 3.6.28, etc.) Our recommendation: Install this inside a Virtual Machine
Once running: