CachyOS Apps

Install Firefox ESR on CachyOS

Standalone web browser from mozilla.org, Extended Support Release.

From the official CachyOS repo. Install with pacman, no AUR helper needed.

Reviewed Nov 2, 2026 · independent guide

How do I install Firefox ESR on CachyOS?

Run this in a terminal, then open Firefox ESR from your app menu:

sudo pacman -S firefox-esr-bin

firefox-esr-bin is in the cachyos repo, the CachyOS project's own package repository, so pacman installs it directly with no AUR helper and no build script. The package is signed with the CachyOS repository key, and pacman checks the signature before it installs.

What should I do after installing Firefox ESR?

  1. Open Firefox ESR from your app menu.
  2. Or run firefox-esr in a terminal.
  3. Run pacman -Qi firefox-esr-bin to see the installed version and the optional dependencies.

How do I update or remove Firefox ESR?

Update:

sudo pacman -Syu

Remove:

sudo pacman -Rns firefox-esr-bin

What is Firefox ESR?

Standalone web browser from mozilla.org, Extended Support Release.

Package description: Standalone web browser from mozilla.org, Extended Support Release

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    Firefox ESR on CachyOS: questions

    Is Firefox ESR in the official CachyOS repo?

    Yes. The firefox-esr-bin package is in the cachyos repo, version 153.3.0-2, built 2026-09-24. Install it with sudo pacman -S firefox-esr-bin.

    Do I need an AUR helper for Firefox ESR?

    No. It comes from the cachyos repo, so plain pacman installs and updates it, and sudo pacman -Syu keeps it current.

    What is the Firefox ESR command?

    firefox-esr. The package is called firefox-esr-bin.