don fisher composed on 2018-08-22 17:50 (UTC-0700):
I could not get older versions to work. Firefox kept updating itself to a newer version. Maybe I will try again another time.
1-download firefox-esr 52 2-disconnect network 3-install Firefox 4-disable automatic updates in prefs or about:config 5-reconnect network 6-use FF normally
Alternatively: 1-create new or restore old FF profile 2-create profile file user.js containing: user_pref("app.update.auto", false); user_pref("app.update.enabled", false); 3-use FF normally
With newer firefox versions, disabling automatic updates is trickier: https://www.ghacks.net/2018/07/28/mozilla-makes-it-more-difficult-to-block-f...