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Sometimes you might need to include changes you've made to Firefox in a new installer. This document shows how to do that.

Sometimes you might need to include changes you've made to Firefox in a new installer. This might be a policies.json file, AutoConfig changes or extensions. This document shows how to do that on Windows operating systems. {for mac} {note}'''Note:''' To see steps for the macOS, refer to [[Deploy Firefox customizations on macOS]].{/note} {/for} =Step 1: Download installer= Download the installer that you want to repackage. Make sure you download a full installer and not a stub installer. The stub installer is typically named "Firefox Installer.exe" whereas the full installer is named "Firefox Setup VERSION.exe." You can download full installer of Firefox Extended Support Release (ESR) from [https://www.mozilla.org/firefox/all/desktop-esr/ here] and of rapid release from [https://www.mozilla.org/firefox/all/desktop-release/ here]. =Step 2: Unzip installer= Unzip the installer into a directory. You'll need to use [https://www.7-zip.org/ 7-zip] in order to unzip it. 7z x "Firefox Setup VERSION.exe" =Step 3: Make changes to Firefox= Make your changes to Firefox in the core subdirectory. =Step 4: Repackage files= Repackage Firefox by running this command in the directory where you unzipped Firefox. 7z a -r -t7z app.7z -mx -m0=BCJ2 -m1=LZMA:d24 -m2=LZMA:d19 -m3=LZMA:d19 -mb0:1 -mb0s1:2 -mb0s2:3 This will create a file called app.7z that contains the changes. =Step 5: Download utilities= Download the files [https://hg.mozilla.org/mozilla-central/raw-file/tip/other-licenses/7zstub/firefox/7zSD.Win32.sfx 7zSD.Win32.sfx] and [https://hg.mozilla.org/mozilla-central/raw-file/tip/browser/installer/windows/app.tag app.tag] and save them in the same directory where the app.7z is located. =Step 6: Create installer= Run this command: copy /B 7zSD.Win32.sfx+app.tag+app.7z our_new_installer.exe to concatenate the files and create the installer. The “/B” is very important! It tells copy that these are binary files so it doesn’t add extra characters to the files.