Release date: 
Tuesday, 22 May, 2018



A Mozilla-based fast browser! Firefox includes:

  • comprehensive popup controls to keep unwanted advertising off your desktop;
  • a tab browsing mode that lets you open several pages in a single window, allowing you to load links in the background without leaving the page you're on;
  • integrated search;
  • simplified privacy controls that let you cover your tracks more effectively;
  • Java plugin support;
  • and a lot more!

Build of current versions is in progress at Please note that printing is disabled in latest builds.

If you use Apache Openoffice as well, be aware, that you need to install the icu-legacy package to have AOO still working (yum install icu-legacy).

This software is distributed in two modes:
  • as compressed package that you have to download and manually install; if prerequisites are required, you will have to manually install them too;
  • as RPM package; you can install it using your favorite rpm package manager, that will take care to download and install both the software and its prerequisites.
Choose the installation mode that you prefer. Please note that not all the versions are available in both the installation modes.

Installation with rpm

This program is installable using the rpm package manager. See below for the install string. Required prerequisites are automatically processed by the package manager and, if needed, downloaded and installed.

firefox-45.9.0-2.oc00 (05/10/2017)
Repository: Arca Noae subscription (authentication required)
Install with ANPM or running the command:
yum install firefox

Manual installation

Programs is distributed as ZIP, 7 ZIP and WarpIN packages: download to temporary directory and unpack to (empty!) destination folder. See below for download link(s).

Must be installed on a partition that supports long filenames, i.e. HPFS or JFS. You can download (and install) dependencies using RPM or downloading and then manually install the Mozilla required dll package.

  • Before starting the program, it is useful to set Mozilla_Home in Config.Sys file, to preserve profile and plugin directories and make program upgrades easier. For example: SET MOZILLA_HOME=C:\Apps\\
  • Use Configure Internet Applications to set Firefox as the default browser app.
  • To run at the same time Firefox with other Mozilla apps, like Thunderbord, use Run!
  • You can load XUL.DLL in high memory using Highmem.
  • Find at all the dictionaries and language packs for Firefox (select the language you want, then at the bottom of the page choose "Version information" and click on "See complete version history"). You need to modify general.useragent.locale setting in about:config from en-US to your locale.
  • A beta version of Java plugin is available.

You can install the prerequisites with rpm running the following string in a command line:

yum install bww-resources-rpm cairo dash-sh fontconfig freetype hunspell libc libc-devel libcx libgcc1 libicu  libjpeg-turbo libkai libpng libstdc++6 libvpx nspr nss nss-util os2-base os2-mpts pango pixman pthread zlib nspr
Following links are to additional programs, not mandatory but useful:

Following ones are the download links for manual installation:

Firefox v. 45.9.0 (22/5/18, bww bitwise works GmbH)

More download links

Firefox v. 45.9.0 (6/10/17, A. Doff)
Firefox v. 45.9.0 (4/10/17, bww bitwise works GmbH)
Firefox v. 45.5.0 (beta 8, package by Doug Bissett, 20/5/17)
Firefox v. 45.5.0 (beta 8, 19/5/17, bww bitwise works GmbH)
Firefox v. 38.8.0 (beta7, 27/5/16, bww bitwise works GmbH)
Firefox v. 38.2.1 (beta 6, 21/2/16, bww bitwise works GmbH)
Firefox v. 31.8.0 (beta 5, 24/7/15, bww bitwise works GmbH)
Firefox v. 24.8.1 (beta 4, 10/3/15, bww bitwise works GmbH)
Firefox v. 45.9.0 (debuginfo, , bww bitwise works GmbH)
Record updated last time on: Wed, 23/05/2018 - 14:16


English Dutch French German Korean Russian Swedish


To get rid of the annoying statement about the need to clean up Firefox, just delete the parent.lock file in your profile once the program is closed. (thanks to Mike Kölling for the tip!)

to load in high memory, run: "highmem.exe -c xul.dll". Please note that this can cause a crash (and damage your user profile) when you unload the dll, that is, when you close Firefox. This is sometimes mitigated by commenting DLLBASING=OFF out of config.sys file.

Not sure whether this is teh correct forum (if not please redirect me to the correct one) ECS 2.1 Downloaded Firefox 38.8.0 (Beta 7), installed Arca Noae Package Manager, installed YUM and updated everything. Get following message when stating Firefox: "Couldn't load xul.dll (OS/2 error 2, faulty module: CAIRO2)"

No Joe, this is not a forum. This is a software catalogue for IBM OS/2 base Operating systems. However, you can try ask here all info you need: maybe the most popular. Thanks to follow us.

Delayed response or choppy window scrolling with FF45.5: please try setting "layout.frame_rate" to "0" in about:config and then report results to

Add new comment