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download an arbitrary old Firefox version for daily browsing — it is a severe security risk. However, if a legacy business or testing requirement forces you to do so:
Downloading an older version of Mozilla Firefox can be a practical necessity for developers testing website backwards compatibility or users with legacy hardware that cannot support the latest web technologies. While Mozilla generally recommends using the most current version for security reasons, they maintain a comprehensive archive of previous releases for these specific use cases. Why Users Download Older Versions download mozilla firefox older version
Before you commit to an insecure old browser, consider these safer alternatives: download an arbitrary old Firefox version for daily

