Using an is the most reliable way to deploy the browser across multiple machines or on computers without an active internet connection. How to Download the Firefox ESR Offline Installer
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If you need an older or very specific build (like ESR 115 for Windows 7/8 users), you can browse the Mozilla Release Archive . Use Firefox as your enterprise browser Using an is the most reliable way to
Select your (Windows 64-bit/32-bit, macOS, or Linux). Pick your Language and click "Download Now" . 2. The Mozilla FTP/Archive (For Specific Versions) firefox esr download offline installer