Firefox – Install Firefox without updates

firefoxupdates

I would like to install an older version of Firefox. I have seen some similar
questions but this is different as I need to disable the initial update not
future updates. I visited this page:

https://support.mozilla.org/kb/install-older-version-of-firefox

which points me here:

https://ftp.mozilla.org/pub/firefox/releases/65.0.2/win32/en-US/

However it seems any method I use results in an upgraded version. I have tried
this method:

  1. install Firefox 65.0.2
  2. launch Firefox
  3. disable updates
  4. restart Firefox

and this:

  1. install Firefox 65.0.2
  2. launch Firefox
  3. disable updates
  4. exit Firefox
  5. install Firefox again
  6. launch Firefox again
  7. restart Firefox

but in both cases Firefox gets updated to version 66.0.3. How can I install an
older Firefox without it updating?

Best Answer

Here is a workaround:

  1. when installing, uncheck "Launch Firefox now"

  2. delete

    C:\Program Files\Mozilla Firefox\updater.exe

Note that you will still see the message "Restart to update Firefox", but if you restart the old version will remain. An alternative workaround is:

  1. when installing, uncheck "Launch Firefox now"

  2. navigate to

    C:\Program Files\Mozilla Firefox\defaults\pref\channel-prefs.js

  3. add this line

    pref('app.update.auto', false);

https://bugzilla.mozilla.org/show_bug.cgi?id=336267

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