Mozilla Firefox ESR Offline Installer

Name: Mozilla Firefox ESR
Availability: InStock
Author: Mozilla

Standalone installer · Full setup · Offline installer free download for Windows/macOS/Linux

Browsers · vLatest ESR · Open Source

Long term support release of the popular Firefox browser, designed for enterprise and

Download link verified by Avinash Verma (Editor) on May 15, 2026 — links go directly to the official source from Mozilla.

License: Open Source

Size: 65 MB

Platforms: Windows macOS Linux

Updated: May 15, 2026

Quick answer: downloading Mozilla Firefox ESR

Mozilla Firefox ESR is a Open Source web browser for Windows/macOS/Linux from Mozilla. Its official offline (standalone) installer is published as a direct download and installs without an internet connection. Always download from the official source (mozilla.org) — we link there directly and never host or modify the file.

Mozilla Firefox ESR Trust & Verification

External authoritative sources that identify and verify Mozilla Firefox ESR.

Wikipedia article

Mozilla Firefox ESR Offline Installer Downloads

Verified installer files, platform packages, store pages, and browser plugins when available.

Platform	Build	Architecture	Package	Download	Notes
Windows	Standard package Firefox ESR Windows 64-bit MSI	64-bit	Official site	Download	Official Mozilla ESR MSI endpoint
macOS	Universal Firefox ESR macOS build	Universal	Official site	Download	Official Mozilla ESR endpoint
Linux	Standard package Firefox ESR Linux 64-bit build	64-bit	Official site	Download	Official Mozilla ESR endpoint

Platform

Build

Architecture

Package

Download

Notes

Windows

Standard package

Firefox ESR Windows 64-bit MSI

64-bit

Official site

Download

Official Mozilla ESR MSI endpoint

macOS

Universal

Firefox ESR macOS build

Universal

Official site

Download

Official Mozilla ESR endpoint

Linux

Standard package

Firefox ESR Linux 64-bit build

64-bit

Official site

Download

Official Mozilla ESR endpoint

Direct installer links are shown only when verified. Store and browser extension rows open the publisher-controlled official destination.

Source: official offline / standalone installer — the verified file above installs without an internet connection.

We do not host software files on our servers. All download links point to the official developer source or a trusted, verified mirror.

Mozilla Firefox ESR Overview

Mozilla Firefox ESR is an Open Source web browser available for Windows and macOS and Linux from Mozilla. The Mozilla Firefox ESR offline installer is a complete standalone setup file — every rendering engine component, extension framework, and security module is packed into a single download that installs without any internet connection. Unlike a web installer or stub downloader that pulls files during setup, the Mozilla Firefox ESR standalone setup works completely offline once downloaded. The Mozilla Firefox ESR standalone installer also makes it easy to keep an archived copy for future reinstalls or rollback scenarios. Download the Mozilla Firefox ESR full setup from the official Mozilla page and get a clean, trusted installation with no bundled adware.

Mozilla Firefox ESR Preview

Mozilla Firefox ESR Browsers preview card — Mozilla Firefox ESR — Browsers

Lead card by OfflineInstallerSetup. Logo and screenshots from the publisher's official sources and Wikipedia / Wikimedia Commons under their respective licenses.

Mozilla Firefox ESR Standalone Installer System Requirements

Baseline requirements to run the current Mozilla Firefox ESR release:

Operating System: Windows 10/11 (64-bit)
Memory (RAM): 2 GB minimum, 4 GB recommended
Disk Space: 500 MB free space
Processor: 1 GHz or faster (64-bit)

How to Install Mozilla Firefox ESR

Follow these steps to install Mozilla Firefox ESR offline on your PC:

1
Download the Mozilla Firefox ESR offline installer from the official source below.
2
Follow the on-screen instructions to select your preferred installation options, such as installation location and additional components.
3
Launch Mozilla Firefox ESR from your desktop or start menu — installation is complete.

Common Mozilla Firefox ESR Installation Issues & Fixes

Ran into a problem? Here are the most common issues and how to fix them:

⚠️

Installation fails with error code 0x80070005

✅

This error indicates a permissions issue. Ensure you are logged in as an administrator or try running the installer as an administrator by right-clicking the file and selecting 'Run as administrator'.

⚠️

Firefox ESR does not start after installation

✅

Check if your system meets the minimum requirements for Firefox ESR. If the issue persists, try reinstalling the software or checking for conflicts with other installed software.