After update date/time format wrong and cannot change
After accidental change to Thunderbird 140.0.1esr (64-bit) all date/time display changed to American format (7/16/2025, 12:55 PM) where it used to be the settings of my machine (Win10 64 bit, language English, region Netherlands): short date dd-MM-yyyy long date ddddd dd-MM-yyyy short time HH:mm long time HH:mm:ss I tried overriding the setting using the config editor and inserted ntl.date_time.pattern_override.date_short and ntl.date_time.pattern_override.time_short, restarted TB which promptly lost the new settings (not saved). Also the Message List Display Options defaults to Cards view after restart, even after changing to Table view.
Please help!
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Since TB refused to accept any config changes I started searching for the file(s) where such changes might be saved, and found the prefs.js. This file turned out to be read-only and not containing the settings I wanted. While TB was down I made the file editable and inserted user_pref("intl.regional_prefs.use_os_locales", true);. After starting TB all problems seemed to be solved, and strangely enough, the file was made read-only again. For now the problem is solved, but what is the use of a config-editor if it ignores changes without any warning that changes cannot be saved?