Jtdcftul

My main question is:

1. What (env) variables control what format the time and date are in in Firefox and what else does that affect (UI, spell-check)?

I tried changing locale settings, packages, Firefox language packs and Firefox settings, but I couldn't figure out a combination to give me the desired result again:

2. How can I use Firefox in en-US (spell-check and, less importantly, UI), but have time displayed in 24h format (and date as anything except for mm DD yy)?

In some previous version of Kubuntu I "fixed" my problem by setting some general parts of my locale to en-GB, but that had the undesirable side effect of changing Pidgin's spell check from en-US to en-GB. This time I cannot even reproduce that result (despite having been taking notes).

I tried many suggestion from StackExchange and elsewhere and none of them worked for me. Luckily I remembered in my desperation that in addition to answering questions on StackExchange I can also ask questions!

Outputs and status:

I am using Firefox 66.0.3 (64-bit) on Kubuntu 18.04.

In Firefox > Addons > Languages, I have both en-US and en-GB installed.

In Firefox > Preferences > Language and Appearance > Language: For both UI language and website display language I tried both en-US and en-GB without any change.

In Firefox from chrome://global/locale/intl.properties:

# This Source Code Form is subject to the terms of the Mozilla Public

# License, v. 2.0. If a copy of the MPL was not distributed with this

# file, You can obtain one at http://mozilla.org/MPL/2.0/.



# LOCALIZATION NOTE (intl.accept_languages):

# This is a comma-separated list of valid BCP 47 language tags.

#

# Begin with the language tag of your locale. Next, include language

# tags for other languages that you expect most users of your locale to be

# able to speak, so that their browsing experience degrades gracefully if

# content is not available in their primary language.

#

# It is recommended that you include "en-US, en" at the end of the list as a

# last resort. However, if you know that users of your locale would prefer a

# different variety of English, or if they are not likely to understand

# English at all, you may opt to include a different English language tag, or

# to exclude English altogether.

#

# For example, the Breton [br] locale might consider including French and

# British English in their list, since those languages are commonly spoken in

# the same area as Breton:

# intl.accept_languages=br, fr-FR, fr, en-GB, en

intl.accept_languages=en-US, en



# LOCALIZATION NOTE (font.language.group):

# This preference controls the initial setting of the language drop-down menu

# in the Content > Fonts & Colors > Advanced preference panel.

#

# Set it to the value of one of the menuitems in the "selectLangs" menulist in

# http://dxr.mozilla.org/mozilla-central/source/browser/components/preferences/fonts.xul

font.language.group=x-western



# LOCALIZATION NOTE (intl.charset.detector):

# This preference controls the initial setting for the character encoding

# detector. Valid values are ja_parallel_state_machine for Japanese, ruprob

# for Russian and ukprob for Ukrainian and the empty string to turn detection

# off. The value must be empty for locales other than Japanese, Russian and

# Ukrainian.

intl.charset.detector=



# LOCALIZATION NOTE (pluralRule): Pick the appropriate plural rule for your

# language. This will determine how many plural forms of a word you will need

# to provide and in what order.

# See: http://developer.mozilla.org/en/docs/Localization_and_Plurals

pluralRule=1



# LOCALIZATION NOTE (intl.menuitems.alwaysappendaccesskeys, intl.menuitems.insertseparatorbeforeaccesskeys):

# Valid values are: true, false, <empty string>

# Missing preference or empty value equals false.

intl.menuitems.alwaysappendaccesskeys=

intl.menuitems.insertseparatorbeforeaccesskeys=true

Output of locale:

LANG=en_US.UTF-8

LANGUAGE=en_US

LC_CTYPE="en_US.UTF-8"

LC_NUMERIC=en_US.UTF-8

LC_TIME=en_GB.UTF-8

LC_COLLATE=C

LC_MONETARY=de_DE.UTF-8

LC_MESSAGES="en_US.UTF-8"

LC_PAPER=et_EE.UTF-8

LC_NAME=et_EE.UTF-8

LC_ADDRESS=et_EE.UTF-8

LC_TELEPHONE=et_EE.UTF-8

LC_MEASUREMENT=de_DE.UTF-8

LC_IDENTIFICATION=et_EE.UTF-8

LC_ALL=

Output of printenv | grep LC_:

LC_MEASUREMENT=de_DE.UTF-8

LC_PAPER=et_EE.UTF-8

LC_MONETARY=de_DE.UTF-8

LC_NAME=et_EE.UTF-8

LC_COLLATE=C

LC_ADDRESS=et_EE.UTF-8

LC_NUMERIC=en_US.UTF-8

LC_TELEPHONE=et_EE.UTF-8

LC_IDENTIFICATION=et_EE.UTF-8

LC_TIME=en_GB.UTF-8

Output of localectl status:

   System Locale: LANG=en_US.UTF-8

                  LC_NUMERIC=et_EE.UTF-8

                  LC_TIME=et_EE.UTF-8

                  LC_MONETARY=et_EE.UTF-8

                  LC_PAPER=et_EE.UTF-8

                  LC_NAME=et_EE.UTF-8

                  LC_ADDRESS=et_EE.UTF-8

                  LC_TELEPHONE=et_EE.UTF-8

                  LC_MEASUREMENT=et_EE.UTF-8

                  LC_IDENTIFICATION=et_EE.UTF-8

       VC Keymap: n/a

      X11 Layout: us

       X11 Model: pc105

Maybe it is also relevant that if I launch Firefox from a terminal I get the following warnings:

(firefox:15865): Gtk-WARNING **: 17:27:21.499: Locale not supported by C library.

        Using the fallback 'C' locale.



(/usr/lib/firefox/firefox:15933): Gtk-WARNING **: 17:27:21.873: Locale not supported by C library.

        Using the fallback 'C' locale.



(/usr/lib/firefox/firefox:15982): Gtk-WARNING **: 17:27:22.569: Locale not supported by C library.

        Using the fallback 'C' locale.



(/usr/lib/firefox/firefox:16024): Gtk-WARNING **: 17:27:24.441: Locale not supported by C library.

        Using the fallback 'C' locale.



(/usr/lib/firefox/firefox:16152): Gtk-WARNING **: 17:27:26.382: Locale not supported by C library.

        Using the fallback 'C' locale.