12-51 52 Esr [new] — Download Firefox

Open the menu (three horizontal lines) and select (or Preferences on Mac). Go to the Advanced panel and select the Update tab.

and select "Check for updates but let you choose whether to install them." Download Firefox 12-51 52 Esr

Versions 12–51 are missing years of security patches against modern malware and hacking techniques. Open the menu (three horizontal lines) and select

If you need to share these links with others, here is a draft for a post: Headline: Need a Legacy Version of Firefox? 🌐 If you need to share these links with

: If you need to stay on an old version, go to Settings > General > Firefox Updates and select "Check for updates but let you choose to install them" to prevent it from jumping to the latest version. ⚠️ Security Warning

If you need help configuring your legacy browser environment, please share: Your current and version. The specific web plugin or application you need to run. Whether the host machine has active internet access .