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Firefox version 115 ESR will be the last supported release for macOS 10.12, 10.13 and 10.14
This article explains how to download and install Firefox on a Mac.
Windows 10 may interrupt your Firefox install with a warning about "Microsoft-verified apps". Firefox is safe to install and use, so choose "install anyway".
Use a Mozilla account to sync your bookmarks, history, passwords, add-ons and open tabs with another device, profile or version of Firefox.
