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jakub-g/installing-old-firefox.md

Last active April 12, 2019 13:11
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Installing old version of Firefox on Windows for testing and preventing it from self-updating
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installing-old-firefox.md
  1. Grab old version of Firefox from Mozilla's FTP. They downloads are placed in folders that follow a simple naming convention. For example v63.0 is here:

https://ftp.mozilla.org/pub/firefox/releases/63.0/win64/en-US/

  1. Run the installer and install it to a folder like c:\software\firefox63

  2. IMPORTANT: turn off internet connectivity at system level before running Firefox for the first time! Otherwise it will automatically self-update! (Windows 10 has "airplane mode").

  3. Create a shortcut with special command line switches

c:\software\firefox63\firefox.exe --no-remote -p

--no-remote allows running multiple versions of Firefox in parallel -p starts the profile manager first to allow you to create a separate profile for that version of Firefox

  1. Start the browser via that shorcut and create a new profile named firefox63

  2. Navigate to about:preferences, search for update and disable automatic updates.

  3. Reenable internet connection.

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