Firefox Old Version May 2026

# Extract to a custom location tar xjf firefox-52.0.2.tar.bz2 -C ~/firefox-old/ # Run from extracted folder without affecting system Firefox ~/firefox-old/firefox/firefox --profilemanager # Create a new profile called "oldprofile" # Launch with that profile ~/firefox-old/firefox/firefox -P oldprofile -no-remote Newer Firefox versions automatically upgrade old profiles. If you share one profile, your old Firefox will corrupt it for newer versions.

When you must, follow this guide to minimize risk. firefox old version