Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

43 files changed, 3576 insertions, 0 deletions

diff --git a/toolkit/locales/en-US/toolkit/about/aboutAbout.ftl b/toolkit/locales/en-US/toolkit/about/aboutAbout.ftl
new file mode 100644
index 0000000000..ce2a311736
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutAbout.ftl
@@ -0,0 +1,9 @@
+# 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/.
+
+about-about-title = About About
+about-about-note =
+    This is a list of “about” pages for your convenience.<br/>
+    Some of them might be confusing. Some are for diagnostic purposes only.<br/>
+    And some are omitted because they require query strings.
diff --git a/toolkit/locales/en-US/toolkit/about/aboutAddons.ftl b/toolkit/locales/en-US/toolkit/about/aboutAddons.ftl
new file mode 100644
index 0000000000..c3ff42e084
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutAddons.ftl
@@ -0,0 +1,511 @@
+# 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/.
+
+addons-window =
+    .title = Add-ons Manager
+addons-page-title = Add-ons Manager
+
+search-header =
+    .placeholder = Search addons.mozilla.org
+    .searchbuttonlabel = Search
+
+search-header-shortcut =
+    .key = f
+
+list-empty-installed =
+    .value = You don’t have any add-ons of this type installed
+
+list-empty-available-updates =
+    .value = No updates found
+
+list-empty-recent-updates =
+    .value = You haven’t recently updated any add-ons
+
+list-empty-find-updates =
+    .label = Check For Updates
+
+list-empty-button =
+    .label = Learn more about add-ons
+
+help-button = Add-ons Support
+sidebar-help-button-title =
+    .title = Add-ons Support
+
+preferences =
+    { PLATFORM() ->
+        [windows] { -brand-short-name } Options
+       *[other] { -brand-short-name } Preferences
+    }
+sidebar-preferences-button-title =
+    .title =
+        { PLATFORM() ->
+            [windows] { -brand-short-name } Options
+           *[other] { -brand-short-name } Preferences
+        }
+
+show-unsigned-extensions-button =
+    .label = Some extensions could not be verified
+
+show-all-extensions-button =
+    .label = Show all extensions
+
+cmd-show-details =
+    .label = Show More Information
+    .accesskey = S
+
+cmd-find-updates =
+    .label = Find Updates
+    .accesskey = F
+
+cmd-preferences =
+    .label =
+        { PLATFORM() ->
+            [windows] Options
+           *[other] Preferences
+        }
+    .accesskey =
+        { PLATFORM() ->
+            [windows] O
+           *[other] P
+        }
+
+cmd-enable-theme =
+    .label = Wear Theme
+    .accesskey = W
+
+cmd-disable-theme =
+    .label = Stop Wearing Theme
+    .accesskey = W
+
+cmd-install-addon =
+    .label = Install
+    .accesskey = I
+
+cmd-contribute =
+    .label = Contribute
+    .accesskey = C
+    .tooltiptext = Contribute to the development of this add-on
+
+detail-version =
+    .label = Version
+
+detail-last-updated =
+    .label = Last Updated
+
+detail-contributions-description = The developer of this add-on asks that you help support its continued development by making a small contribution.
+
+detail-contributions-button = Contribute
+    .title = Contribute to the development of this add-on
+    .accesskey = C
+
+detail-update-type =
+    .value = Automatic Updates
+
+detail-update-default =
+    .label = Default
+    .tooltiptext = Automatically install updates only if that’s the default
+
+detail-update-automatic =
+    .label = On
+    .tooltiptext = Automatically install updates
+
+detail-update-manual =
+    .label = Off
+    .tooltiptext = Don’t automatically install updates
+
+# Used as a description for the option to allow or block an add-on in private windows.
+detail-private-browsing-label = Run in Private Windows
+
+# Some add-ons may elect to not run in private windows by setting incognito: not_allowed in the manifest.  This
+# cannot be overridden by the user.
+detail-private-disallowed-label = Not Allowed in Private Windows
+detail-private-disallowed-description2 = This extension does not run while private browsing. <a data-l10n-name="learn-more">Learn more</a>
+
+# Some special add-ons are privileged, run in private windows automatically, and this permission can't be revoked
+detail-private-required-label = Requires Access to Private Windows
+detail-private-required-description2 = This extension has access to your online activities while private browsing. <a data-l10n-name="learn-more">Learn more</a>
+
+detail-private-browsing-on =
+    .label = Allow
+    .tooltiptext = Enable in Private Browsing
+
+detail-private-browsing-off =
+    .label = Don’t Allow
+    .tooltiptext = Disable in Private Browsing
+
+detail-home =
+    .label = Homepage
+
+detail-home-value =
+    .value = { detail-home.label }
+
+detail-repository =
+    .label = Add-on Profile
+
+detail-repository-value =
+    .value = { detail-repository.label }
+
+detail-check-for-updates =
+    .label = Check for Updates
+    .accesskey = U
+    .tooltiptext = Check for updates for this add-on
+
+detail-show-preferences =
+    .label =
+        { PLATFORM() ->
+            [windows] Options
+           *[other] Preferences
+        }
+    .accesskey =
+        { PLATFORM() ->
+            [windows] O
+           *[other] P
+        }
+    .tooltiptext =
+        { PLATFORM() ->
+            [windows] Change this add-on’s options
+           *[other] Change this add-on’s preferences
+        }
+
+detail-rating =
+    .value = Rating
+
+addon-restart-now =
+    .label = Restart now
+
+disabled-unsigned-heading =
+    .value = Some add-ons have been disabled
+
+disabled-unsigned-description =
+    The following add-ons have not been verified for use in { -brand-short-name }. You can
+    <label data-l10n-name="find-addons">find replacements</label> or ask the developer to get them verified.
+
+disabled-unsigned-learn-more = Learn more about our efforts to help keep you safe online.
+
+disabled-unsigned-devinfo =
+    Developers interested in getting their add-ons verified can continue by reading our
+    <label data-l10n-name="learn-more">manual</label>.
+
+plugin-deprecation-description =
+    Missing something? Some plugins are no longer supported by { -brand-short-name }. <label data-l10n-name="learn-more">Learn More.</label>
+
+legacy-warning-show-legacy = Show legacy extensions
+
+legacy-extensions =
+    .value = Legacy Extensions
+
+legacy-extensions-description =
+    These extensions do not meet current { -brand-short-name } standards so they have been deactivated. <label data-l10n-name="legacy-learn-more">Learn about the changes to add-ons</label>
+
+private-browsing-description2 =
+    { -brand-short-name } is changing how extensions work in private browsing. Any new extensions you add to
+    { -brand-short-name } won’t run by default in Private Windows. Unless you allow it in settings, the
+    extension won’t work while private browsing, and won’t have access to your online activities
+    there. We’ve made this change to keep your private browsing private.
+    <label data-l10n-name="private-browsing-learn-more">Learn how to manage extension settings</label>
+
+addon-category-discover = Recommendations
+addon-category-discover-title =
+    .title = Recommendations
+addon-category-extension = Extensions
+addon-category-extension-title =
+    .title = Extensions
+addon-category-theme = Themes
+addon-category-theme-title =
+    .title = Themes
+addon-category-plugin = Plugins
+addon-category-plugin-title =
+    .title = Plugins
+addon-category-dictionary = Dictionaries
+addon-category-dictionary-title =
+    .title = Dictionaries
+addon-category-locale = Languages
+addon-category-locale-title =
+    .title = Languages
+addon-category-available-updates = Available Updates
+addon-category-available-updates-title =
+    .title = Available Updates
+addon-category-recent-updates = Recent Updates
+addon-category-recent-updates-title =
+    .title = Recent Updates
+
+## These are global warnings
+
+extensions-warning-safe-mode = All add-ons have been disabled by safe mode.
+extensions-warning-check-compatibility = Add-on compatibility checking is disabled. You may have incompatible add-ons.
+extensions-warning-check-compatibility-button = Enable
+    .title = Enable add-on compatibility checking
+extensions-warning-update-security = Add-on update security checking is disabled. You may be compromised by updates.
+extensions-warning-update-security-button = Enable
+    .title = Enable add-on update security checking
+
+
+## Strings connected to add-on updates
+
+addon-updates-check-for-updates = Check for Updates
+    .accesskey = C
+addon-updates-view-updates = View Recent Updates
+    .accesskey = V
+
+# This menu item is a checkbox that toggles the default global behavior for
+# add-on update checking.
+
+addon-updates-update-addons-automatically = Update Add-ons Automatically
+    .accesskey = A
+
+## Specific add-ons can have custom update checking behaviors ("Manually",
+## "Automatically", "Use default global behavior"). These menu items reset the
+## update checking behavior for all add-ons to the default global behavior
+## (which itself is either "Automatically" or "Manually", controlled by the
+## extensions-updates-update-addons-automatically.label menu item).
+
+addon-updates-reset-updates-to-automatic = Reset All Add-ons to Update Automatically
+    .accesskey = R
+addon-updates-reset-updates-to-manual = Reset All Add-ons to Update Manually
+    .accesskey = R
+
+## Status messages displayed when updating add-ons
+
+addon-updates-updating = Updating add-ons
+addon-updates-installed = Your add-ons have been updated.
+addon-updates-none-found = No updates found
+addon-updates-manual-updates-found = View Available Updates
+
+## Add-on install/debug strings for page options menu
+
+addon-install-from-file = Install Add-on From File…
+    .accesskey = I
+addon-install-from-file-dialog-title = Select add-on to install
+addon-install-from-file-filter-name = Add-ons
+addon-open-about-debugging = Debug Add-ons
+    .accesskey = b
+
+## Extension shortcut management
+
+# This is displayed in the page options menu
+addon-manage-extensions-shortcuts = Manage Extension Shortcuts
+    .accesskey = S
+
+shortcuts-no-addons = You don’t have any extensions enabled.
+shortcuts-no-commands = The following extensions do not have shortcuts:
+shortcuts-input =
+  .placeholder = Type a shortcut
+
+shortcuts-browserAction2 = Activate toolbar button
+shortcuts-pageAction = Activate page action
+shortcuts-sidebarAction = Toggle the sidebar
+
+shortcuts-modifier-mac = Include Ctrl, Alt, or ⌘
+shortcuts-modifier-other = Include Ctrl or Alt
+shortcuts-invalid = Invalid combination
+shortcuts-letter = Type a letter
+shortcuts-system = Can’t override a { -brand-short-name } shortcut
+
+# String displayed in warning label when there is a duplicate shortcut
+shortcuts-duplicate = Duplicate shortcut
+
+# String displayed when a keyboard shortcut is already assigned to more than one add-on
+# Variables:
+#   $shortcut (string) - Shortcut string for the add-on
+shortcuts-duplicate-warning-message = { $shortcut } is being used as a shortcut in more than one case. Duplicate shortcuts may cause unexpected behavior.
+
+# String displayed when a keyboard shortcut is already used by another add-on
+# Variables:
+#   $addon (string) - Name of the add-on
+shortcuts-exists = Already in use by { $addon }
+
+shortcuts-card-expand-button =
+    { $numberToShow ->
+        *[other] Show { $numberToShow } More
+    }
+
+shortcuts-card-collapse-button = Show Less
+
+header-back-button =
+    .title = Go back
+
+## Recommended add-ons page
+
+# Explanatory introduction to the list of recommended add-ons. The action word
+# ("recommends") in the final sentence is a link to external documentation.
+discopane-intro =
+    Extensions and themes are like apps for your browser, and they let you
+    protect passwords, download videos, find deals, block annoying ads, change
+    how your browser looks, and much more. These small software programs are
+    often developed by a third party. Here’s a selection { -brand-product-name }
+    <a data-l10n-name="learn-more-trigger">recommends</a> for exceptional
+    security, performance, and functionality.
+
+# Notice to make user aware that the recommendations are personalized.
+discopane-notice-recommendations =
+    Some of these recommendations are personalized. They are based on other
+    extensions you’ve installed, profile preferences, and usage statistics.
+discopane-notice-learn-more = Learn more
+
+privacy-policy = Privacy Policy
+
+# Refers to the author of an add-on, shown below the name of the add-on.
+# Variables:
+#   $author (string) - The name of the add-on developer.
+created-by-author = by <a data-l10n-name="author">{ $author }</a>
+# Shows the number of daily users of the add-on.
+# Variables:
+#   $dailyUsers (number) - The number of daily users.
+user-count = Users: { $dailyUsers }
+install-extension-button = Add to { -brand-product-name }
+install-theme-button = Install Theme
+# The label of the button that appears after installing an add-on. Upon click,
+# the detailed add-on view is opened, from where the add-on can be managed.
+manage-addon-button = Manage
+find-more-addons = Find more add-ons
+
+# This is a label for the button to open the "more options" menu, it is only
+# used for screen readers.
+addon-options-button =
+    .aria-label = More Options
+
+## Add-on actions
+report-addon-button = Report
+remove-addon-button = Remove
+# The link will always be shown after the other text.
+remove-addon-disabled-button = Can’t Be Removed <a data-l10n-name="link">Why?</a>
+disable-addon-button = Disable
+enable-addon-button = Enable
+# This is used for the toggle on the extension card, it's a checkbox and this
+# is always its label.
+extension-enable-addon-button-label =
+    .aria-label = Enable
+preferences-addon-button =
+    { PLATFORM() ->
+        [windows] Options
+       *[other] Preferences
+    }
+details-addon-button = Details
+release-notes-addon-button = Release Notes
+permissions-addon-button = Permissions
+
+extension-enabled-heading = Enabled
+extension-disabled-heading = Disabled
+
+theme-enabled-heading = Enabled
+theme-disabled-heading = Disabled
+
+plugin-enabled-heading = Enabled
+plugin-disabled-heading = Disabled
+
+dictionary-enabled-heading = Enabled
+dictionary-disabled-heading = Disabled
+
+locale-enabled-heading = Enabled
+locale-disabled-heading = Disabled
+
+ask-to-activate-button = Ask to Activate
+always-activate-button = Always Activate
+never-activate-button = Never Activate
+
+addon-detail-author-label = Author
+addon-detail-version-label = Version
+addon-detail-last-updated-label = Last Updated
+addon-detail-homepage-label = Homepage
+addon-detail-rating-label = Rating
+
+# Message for add-ons with a staged pending update.
+install-postponed-message = This extension will be updated when { -brand-short-name } restarts.
+install-postponed-button = Update Now
+
+# The average rating that the add-on has received.
+# Variables:
+#   $rating (number) - A number between 0 and 5. The translation should show at most one digit after the comma.
+five-star-rating =
+  .title = Rated { NUMBER($rating, maximumFractionDigits: 1) } out of 5
+
+# This string is used to show that an add-on is disabled.
+# Variables:
+#   $name (string) - The name of the add-on
+addon-name-disabled = { $name } (disabled)
+
+# The number of reviews that an add-on has received on AMO.
+# Variables:
+#   $numberOfReviews (number) - The number of reviews received
+addon-detail-reviews-link =
+    { $numberOfReviews ->
+        [one] { $numberOfReviews } review
+       *[other] { $numberOfReviews } reviews
+    }
+
+## Pending uninstall message bar
+
+# Variables:
+#   $addon (string) - Name of the add-on
+pending-uninstall-description = <span data-l10n-name="addon-name">{ $addon }</span> has been removed.
+pending-uninstall-undo-button = Undo
+
+addon-detail-updates-label = Allow automatic updates
+addon-detail-updates-radio-default = Default
+addon-detail-updates-radio-on = On
+addon-detail-updates-radio-off = Off
+addon-detail-update-check-label = Check for Updates
+install-update-button = Update
+
+# This is the tooltip text for the private browsing badge in about:addons. The
+# badge is the private browsing icon included next to the extension's name.
+addon-badge-private-browsing-allowed2 =
+    .title = Allowed in private windows
+    .aria-label = { addon-badge-private-browsing-allowed2.title }
+addon-detail-private-browsing-help = When allowed, the extension will have access to your online activities while private browsing. <a data-l10n-name="learn-more">Learn more</a>
+addon-detail-private-browsing-allow = Allow
+addon-detail-private-browsing-disallow = Don’t Allow
+
+## This is the tooltip text for the recommended badges for an extension in about:addons. The
+## badge is a small icon displayed next to an extension when it is recommended on AMO.
+
+addon-badge-recommended2 =
+  .title = { -brand-product-name } only recommends extensions that meet our standards for security and performance
+  .aria-label = { addon-badge-recommended2.title }
+# We hard code "Mozilla" in the string below because the extensions are built
+# by Mozilla and we don't want forks to display "by Fork".
+addon-badge-line3 =
+  .title = Official extension built by Mozilla. Meets security and performance standards
+  .aria-label = { addon-badge-line3.title }
+addon-badge-verified2 =
+  .title = This extension has been reviewed to meet our standards for security and performance
+  .aria-label = { addon-badge-verified2.title }
+
+##
+
+available-updates-heading = Available Updates
+recent-updates-heading = Recent Updates
+
+release-notes-loading = Loading…
+release-notes-error = Sorry, but there was an error loading the release notes.
+
+addon-permissions-empty = This extension doesn’t require any permissions
+addon-permissions-required = Required permissions for core functionality:
+addon-permissions-optional = Optional permissions for added functionality:
+addon-permissions-learnmore = Learn more about permissions
+
+recommended-extensions-heading = Recommended Extensions
+recommended-themes-heading = Recommended Themes
+
+# A recommendation for the Firefox Color theme shown at the bottom of the theme
+# list view. The "Firefox Color" name itself should not be translated.
+recommended-theme-1 = Feeling creative? <a data-l10n-name="link">Build your own theme with Firefox Color.</a>
+
+## Page headings
+
+extension-heading = Manage Your Extensions
+theme-heading = Manage Your Themes
+plugin-heading = Manage Your Plugins
+dictionary-heading = Manage Your Dictionaries
+locale-heading = Manage Your Languages
+updates-heading = Manage Your Updates
+discover-heading = Personalize Your { -brand-short-name }
+shortcuts-heading = Manage Extension Shortcuts
+
+default-heading-search-label = Find more add-ons
+addons-heading-search-input =
+    .placeholder = Search addons.mozilla.org
+
+addon-page-options-button =
+    .title = Tools for all add-ons
diff --git a/toolkit/locales/en-US/toolkit/about/aboutCompat.ftl b/toolkit/locales/en-US/toolkit/about/aboutCompat.ftl
new file mode 100644
index 0000000000..6ee637222f
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutCompat.ftl
@@ -0,0 +1,13 @@
+# 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/.
+
+label-disable = Disable
+label-enable = Enable
+label-interventions = Interventions
+label-more-information = More Information: Bug { $bug }
+label-overrides = User Agent Overrides
+text-disabled-in-about-config = This feature has been disabled in about:config
+text-no-interventions = No interventions are being used
+text-no-overrides = No UA overrides are being used
+text-title = about:compat
diff --git a/toolkit/locales/en-US/toolkit/about/aboutConfig.ftl b/toolkit/locales/en-US/toolkit/about/aboutConfig.ftl
new file mode 100644
index 0000000000..7de3167c62
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutConfig.ftl
@@ -0,0 +1,106 @@
+# 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/.
+
+config-window =
+    .title = about:config
+
+## Strings used to display a warning in about:config
+
+# This text should be attention grabbing and playful
+config-about-warning-title =
+    .value = This might void your warranty!
+config-about-warning-text = Changing these advanced settings can be harmful to the stability, security, and performance of this application. You should only continue if you are sure of what you are doing.
+config-about-warning-button =
+    .label = I accept the risk!
+config-about-warning-checkbox =
+    .label = Show this warning next time
+
+config-search-prefs =
+    .value = Search:
+    .accesskey = r
+
+config-focus-search =
+    .key = r
+
+config-focus-search-2 =
+    .key = f
+
+## These strings are used for column headers
+config-pref-column =
+    .label = Preference Name
+config-lock-column =
+    .label = Status
+config-type-column =
+    .label = Type
+config-value-column =
+    .label = Value
+
+## These strings are used for tooltips
+config-pref-column-header =
+    .tooltip = Click to sort
+config-column-chooser =
+    .tooltip = Click to select columns to display
+
+## These strings are used for the context menu
+config-copy-pref =
+    .key = C
+    .label = Copy
+    .accesskey = C
+
+config-copy-name =
+    .label = Copy Name
+    .accesskey = N
+
+config-copy-value =
+    .label = Copy Value
+    .accesskey = V
+
+config-modify =
+    .label = Modify
+    .accesskey = M
+
+config-toggle =
+    .label = Toggle
+    .accesskey = T
+
+config-reset =
+    .label = Reset
+    .accesskey = R
+
+config-new =
+    .label = New
+    .accesskey = w
+
+config-string =
+    .label = String
+    .accesskey = S
+
+config-integer =
+    .label = Integer
+    .accesskey = I
+
+config-boolean =
+    .label = Boolean
+    .accesskey = B
+
+config-default = default
+config-modified = modified
+config-locked = locked
+
+config-property-string = string
+config-property-int = integer
+config-property-bool = boolean
+
+config-new-prompt = Enter the preference name
+
+config-nan-title = Invalid value
+config-nan-text = The text you entered is not a number.
+
+# Variables:
+#   $type (String): type of value (boolean, integer or string)
+config-new-title = New { $type } value
+
+# Variables:
+#   $type (String): type of value (boolean, integer or string)
+config-modify-title = Enter { $type } value
diff --git a/toolkit/locales/en-US/toolkit/about/aboutGlean.ftl b/toolkit/locales/en-US/toolkit/about/aboutGlean.ftl
new file mode 100644
index 0000000000..ecdbfb0514
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutGlean.ftl
@@ -0,0 +1,14 @@
+# 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/.
+
+### "Glean" and "Glean SDK" should remain in English.
+
+about-glean-page-title = About Glean
+about-glean-description = The <a data-l10n-name="glean-sdk-doc-link">Glean SDK</a> is a data collection library used in Mozilla products. This page is for developers and testers who need to <a data-l10n-name="fog-debug-doc-link">configure debugging and logging state in the Glean SDK</a>.
+about-glean-warning = Misusing this interface may crash { -brand-short-name }.
+
+tag-pings-label = Tag all sent pings with this tag
+log-pings-label = Log ping payload before sending?
+send-pings-label = Send the named ping
+controls-button-label = Submit Settings
diff --git a/toolkit/locales/en-US/toolkit/about/aboutHttpsOnlyError.ftl b/toolkit/locales/en-US/toolkit/about/aboutHttpsOnlyError.ftl
new file mode 100644
index 0000000000..46786dd9dc
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutHttpsOnlyError.ftl
@@ -0,0 +1,18 @@
+# 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/.
+
+about-httpsonly-title-alert = HTTPS-Only Mode Alert
+about-httpsonly-title-connection-not-available = Secure Connection Not Available
+
+# Variables:
+#   $websiteUrl (String) - Url of the website that failed to load. Example: www.example.com
+about-httpsonly-explanation-unavailable2 = You’ve enabled HTTPS-Only Mode for enhanced security, and a HTTPS version of <em>{ $websiteUrl }</em> is not available.
+about-httpsonly-explanation-question = What could be causing this?
+about-httpsonly-explanation-nosupport = Most likely, the website simply does not support HTTPS.
+about-httpsonly-explanation-risk = It’s also possible that an attacker is involved. If you decide to visit the website, you should not enter any sensitive information like passwords, emails, or credit card details.
+about-httpsonly-explanation-continue = If you continue, HTTPS-Only Mode will be turned off temporarily for this site.
+
+about-httpsonly-button-continue-to-site = Continue to HTTP Site
+about-httpsonly-button-go-back = Go Back
+about-httpsonly-link-learn-more = Learn More…
diff --git a/toolkit/locales/en-US/toolkit/about/aboutMozilla.ftl b/toolkit/locales/en-US/toolkit/about/aboutMozilla.ftl
new file mode 100644
index 0000000000..f0d0f336e5
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutMozilla.ftl
@@ -0,0 +1,11 @@
+# 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/.
+
+about-mozilla-title-6-27 = The Book of Mozilla, 6:27
+about-mozilla-quote-6-27 =
+    The Beast continued its studies with renewed <em>Focus</em>, building great <em>Reference</em>
+    works and contemplating new <em>Realities</em>. The Beast brought forth its followers and
+    acolytes to create a renewed smaller form of itself and, through <em>Mischievous</em> means,
+    sent it out across the world.
+about-mozilla-from-6-27 = from <strong>The Book of Mozilla,</strong> 6:27
diff --git a/toolkit/locales/en-US/toolkit/about/aboutNetworking.ftl b/toolkit/locales/en-US/toolkit/about/aboutNetworking.ftl
new file mode 100644
index 0000000000..da541048f1
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutNetworking.ftl
@@ -0,0 +1,72 @@
+# 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/.
+
+about-networking-title = About Networking
+about-networking-http = HTTP
+about-networking-sockets = Sockets
+about-networking-dns = DNS
+about-networking-dns-clear-cache-button = Clear DNS Cache
+about-networking-dns-trr-url = DoH URL
+about-networking-dns-suffix = DNS suffix
+about-networking-websockets = WebSockets
+about-networking-refresh = Refresh
+about-networking-auto-refresh = Autorefresh every 3 seconds
+about-networking-hostname = Hostname
+about-networking-port = Port
+about-networking-http-version = HTTP Version
+about-networking-ssl = SSL
+about-networking-active = Active
+about-networking-idle = Idle
+about-networking-host = Host
+about-networking-tcp = TCP
+about-networking-sent = Sent
+about-networking-received = Received
+about-networking-family = Family
+about-networking-trr = TRR
+about-networking-addresses = Addresses
+about-networking-expires = Expires (Seconds)
+about-networking-originAttributesSuffix = Isolation Key
+about-networking-messages-sent = Messages Sent
+about-networking-messages-received = Messages Received
+about-networking-bytes-sent = Bytes Sent
+about-networking-bytes-received = Bytes Received
+about-networking-logging = Logging
+about-networking-log-tutorial =
+    See <a data-l10n-name="logging">HTTP Logging</a>
+    for instructions on how to use this tool.
+about-networking-current-log-file = Current Log File:
+about-networking-current-log-modules = Current Log Modules:
+about-networking-set-log-file = Set Log File
+about-networking-set-log-modules = Set Log Modules
+about-networking-start-logging = Start Logging
+about-networking-stop-logging = Stop Logging
+about-networking-dns-lookup = DNS Lookup
+about-networking-dns-lookup-button = Resolve
+about-networking-dns-domain = Domain:
+about-networking-dns-lookup-table-column = IPs
+about-networking-dns-https-rr-lookup-table-column = HTTP RRs
+about-networking-rcwn = RCWN Stats
+about-networking-rcwn-status = RCWN Status
+about-networking-rcwn-cache-won-count = Cache won count
+about-networking-rcwn-net-won-count = Net won count
+about-networking-total-network-requests = Total network request count
+about-networking-rcwn-operation = Cache Operation
+about-networking-rcwn-perf-open = Open
+about-networking-rcwn-perf-read = Read
+about-networking-rcwn-perf-write = Write
+about-networking-rcwn-perf-entry-open = Entry Open
+about-networking-rcwn-avg-short = Short Average
+about-networking-rcwn-avg-long = Long Average
+about-networking-rcwn-std-dev-long = Long Standard Deviation
+about-networking-rcwn-cache-slow = Cache slow count
+about-networking-rcwn-cache-not-slow = Cache not slow count
+about-networking-networkid = Network ID
+about-networking-networkid-id = Network ID
+
+## Link is intended as "network link"
+
+about-networking-networkid-is-up = Link is up
+about-networking-networkid-status-known = Link status is known
+
+##
diff --git a/toolkit/locales/en-US/toolkit/about/aboutPerformance.ftl b/toolkit/locales/en-US/toolkit/about/aboutPerformance.ftl
new file mode 100644
index 0000000000..952e4cb143
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutPerformance.ftl
@@ -0,0 +1,61 @@
+# 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/.
+
+# Page title
+about-performance-title = Task Manager
+
+## Column headers
+column-name = Name
+column-type = Type
+column-energy-impact = Energy Impact
+column-memory = Memory
+
+## Special values for the Name column
+ghost-windows = Recently closed tabs
+# Variables:
+#   $title (String) - the title of the preloaded page, typically 'New Tab'
+preloaded-tab = Preloaded: { $title }
+
+## Values for the Type column
+type-tab = Tab
+type-subframe = Subframe
+type-tracker = Tracker
+type-addon = Add-on
+type-browser = Browser
+type-worker = Worker
+type-other = Other
+
+## Values for the Energy Impact column
+##
+## Variables:
+##   $value (Number) - Value of the energy impact, eg. 0.25 (low),
+##                     5.38 (medium), 105.38 (high)
+energy-impact-high = High ({ $value })
+energy-impact-medium = Medium ({ $value })
+energy-impact-low = Low ({ $value })
+
+## Values for the Memory column
+##
+## Variables:
+##   $value (Number) - How much memory is used
+size-KB = { $value } KB
+size-MB = { $value } MB
+size-GB = { $value } GB
+
+## Tooltips for the action buttons
+close-tab =
+    .title = Close tab
+show-addon =
+    .title = Show in Add-ons Manager
+
+# Tooltip when hovering an item of the about:performance table
+# Variables:
+#   $totalDispatches (Number) - how many dispatches occurred for this page since it loaded
+#   $totalDuration (Number) - how much CPU time was used by this page since it loaded
+#   $dispatchesSincePrevious (Number) - how many dispatches occurred in the last 2 seconds
+#   $durationSincePrevious (Number) - how much CPU time was used in the last 2 seconds
+item =
+    .title =
+        Dispatches since load: { $totalDispatches } ({ $totalDuration }ms)
+        Dispatches in the last seconds: { $dispatchesSincePrevious } ({ $durationSincePrevious }ms)
diff --git a/toolkit/locales/en-US/toolkit/about/aboutPlugins.ftl b/toolkit/locales/en-US/toolkit/about/aboutPlugins.ftl
new file mode 100644
index 0000000000..b9860737a5
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutPlugins.ftl
@@ -0,0 +1,33 @@
+# 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/.
+
+title-label = About Plugins
+
+installed-plugins-label = Installed plugins
+no-plugins-are-installed-label = No installed plugins found
+
+deprecation-description = Missing something? Some plugins are no longer supported. <a data-l10n-name="deprecation-link">Learn More.</a>
+
+## The information of plugins
+##
+## Variables:
+##   $pluginLibraries: the plugin library
+##   $pluginFullPath: path of the plugin
+##   $version: version of the plugin
+file-dd = <span data-l10n-name="file">File:</span> { $pluginLibraries }
+path-dd = <span data-l10n-name="path">Path:</span> { $pluginFullPath }
+version-dd = <span data-l10n-name="version">Version:</span> { $version }
+
+## These strings describe the state of plugins
+##
+## Variables:
+##   $blockListState: show some special state of the plugin, such as blocked, outdated
+state-dd-enabled = <span data-l10n-name="state">State:</span> Enabled
+state-dd-enabled-block-list-state = <span data-l10n-name="state">State:</span> Enabled ({ $blockListState })
+state-dd-Disabled = <span data-l10n-name="state">State:</span> Disabled
+state-dd-Disabled-block-list-state = <span data-l10n-name="state">State:</span> Disabled ({ $blockListState })
+
+mime-type-label = MIME Type
+description-label = Description
+suffixes-label = Suffixes
diff --git a/toolkit/locales/en-US/toolkit/about/aboutProcesses.ftl b/toolkit/locales/en-US/toolkit/about/aboutProcesses.ftl
new file mode 100644
index 0000000000..a96e9d333e
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutProcesses.ftl
@@ -0,0 +1,143 @@
+# 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/.
+
+# Page title
+about-processes-title = Process Manager
+
+# The Actions column
+about-processes-column-action =
+    .title = Actions
+
+## Tooltips
+
+about-processes-shutdown-process =
+    .title = Unload tabs and kill process
+about-processes-shutdown-tab =
+    .title = Close tab
+
+## Column headers
+
+about-processes-column-name = Name
+about-processes-column-memory-resident = Memory
+about-processes-column-cpu-total = CPU
+
+## Process names
+## Variables:
+##    $pid (String) The process id of this process, assigned by the OS.
+##    $origin (String) The domain name for this process.
+##    $type (String) The raw type for this process. Used for unknown processes.
+
+about-processes-browser-process-name = { -brand-short-name } (process { $pid })
+about-processes-web-process-name = Web (process { $pid }, shared)
+about-processes-web-isolated-process-name = Web (process { $pid }) for { $origin }
+about-processes-web-large-allocation = Web (process { $pid }, large) for { $origin }
+about-processes-with-coop-coep-process-name = Web (process { $pid }, cross-origin isolated) for { $origin }
+about-processes-file-process-name = Files (process { $pid })
+about-processes-extension-process-name = Extensions (process { $pid })
+about-processes-privilegedabout-process-name = About (process { $pid })
+about-processes-plugin-process-name = Plugins (process { $pid })
+about-processes-privilegedmozilla-process-name = Web (process { $pid }) for { -vendor-short-name } sites
+about-processes-gmp-plugin-process-name = Gecko Media Plugins (process { $pid })
+about-processes-gpu-process-name = GPU (process { $pid })
+about-processes-vr-process-name = VR (process { $pid })
+about-processes-rdd-process-name = Data Decoder (process { $pid })
+about-processes-socket-process-name = Network (process { $pid })
+about-processes-remote-sandbox-broker-process-name = Remote Sandbox Broker (process { $pid })
+about-processes-fork-server-process-name = Fork Server (process { $pid })
+about-processes-preallocated-process-name = Preallocated (process { $pid })
+about-processes-unknown-process-name = Other ({ $type }, process { $pid })
+
+
+# Process
+# Variables:
+#   $name (String) The name assigned to the process.
+#   $pid (String) The process id of this process, assigned by the OS.
+about-processes-process-name = Process { $pid }: { $name }
+
+## Details within processes
+
+# Single-line summary of threads
+# Variables:
+#    $number (Number) The number of threads in the process. Typically larger
+#                     than 30. We don't expect to ever have processes with less
+#                     than 5 threads.
+about-processes-thread-summary = Threads ({ $number })
+
+# Thread details
+# Variables:
+#   $name (String) The name assigned to the thread.
+#   $tid (String) The thread id of this thread, assigned by the OS.
+about-processes-thread-name = Thread { $tid }: { $name }
+
+# Tab
+# Variables:
+#   $name (String) The name of the tab (typically the title of the page, might be the url while the page is loading).
+about-processes-tab-name = Tab: { $name }
+about-processes-preloaded-tab = Preloaded New Tab
+
+# Single subframe
+# Variables:
+#   $url (String) The full url of this subframe.
+about-processes-frame-name-one = Subframe: { $url }
+
+# Group of subframes
+# Variables:
+#   $number (Number) The number of subframes in this group. Always ≥ 1.
+#   $shortUrl (String) The shared prefix for the subframes in the group.
+about-processes-frame-name-many = Subframes ({ $number }): { $shortUrl }
+
+## Displaying CPU (percentage and total)
+## Variables:
+##    $percent (Number) The percentage of CPU used by the process or thread.
+##                      Always > 0, generally <= 200.
+##    $total (Number) The amount of time used by the process or thread since
+##                    its start.
+##    $unit (String) The unit in which to display $total. See the definitions
+##                   of `duration-unit-*`.
+
+# Common case.
+about-processes-cpu-user-and-kernel = { NUMBER($percent, maximumSignificantDigits: 2, style: "percent") } ({ NUMBER($total, maximumFractionDigits: 0) }{ $unit })
+
+# Special case: data is not available yet.
+about-processes-cpu-user-and-kernel-not-ready = (measuring)
+
+# Special case: process or thread is currently idle.
+about-processes-cpu-user-and-kernel-idle = idle ({ NUMBER($total, maximumFractionDigits: 2) }{ $unit })
+
+## Displaying Memory (total and delta)
+## Variables:
+##    $total (Number) The amount of memory currently used by the process.
+##    $totalUnit (String) The unit in which to display $total. See the definitions
+##                        of `memory-unit-*`.
+##    $delta (Number) The absolute value of the amount of memory added recently.
+##    $deltaSign (String) Either "+" if the amount of memory has increased
+##                        or "-" if it has decreased.
+##    $deltaUnit (String) The unit in which to display $delta. See the definitions
+##                        of `memory-unit-*`.
+
+# Common case.
+about-processes-total-memory-size = { NUMBER($total, maximumFractionDigits:0) }{ $totalUnit } ({ $deltaSign }{ NUMBER($delta, maximumFractionDigits:0) }{ $deltaUnit })
+
+# Special case: no change.
+about-processes-total-memory-size-no-change = { NUMBER($total, maximumFractionDigits:0) }{ $totalUnit }
+
+## Duration units
+
+duration-unit-ns = ns
+duration-unit-us = µs
+duration-unit-ms = ms
+duration-unit-s = s
+duration-unit-m = m
+duration-unit-h = h
+duration-unit-d = d
+
+## Memory units
+
+memory-unit-B = B
+memory-unit-KB = KB
+memory-unit-MB = MB
+memory-unit-GB = GB
+memory-unit-TB = TB
+memory-unit-PB = PB
+memory-unit-EB = EB
diff --git a/toolkit/locales/en-US/toolkit/about/aboutProfiles.ftl b/toolkit/locales/en-US/toolkit/about/aboutProfiles.ftl
new file mode 100644
index 0000000000..c11b89b321
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutProfiles.ftl
@@ -0,0 +1,74 @@
+# 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/.
+
+
+profiles-title = About Profiles
+profiles-subtitle = This page helps you to manage your profiles. Each profile is a separate world which contains separate history, bookmarks, settings and add-ons.
+profiles-create = Create a New Profile
+profiles-restart-title = Restart
+profiles-restart-in-safe-mode = Restart with Add-ons Disabled…
+profiles-restart-normal = Restart normally…
+profiles-conflict = Another copy of { -brand-product-name } has made changes to profiles. You must restart { -brand-short-name } before making more changes.
+profiles-flush-fail-title = Changes not saved
+profiles-flush-conflict = { profiles-conflict }
+profiles-flush-failed = An unexpected error has prevented your changes from being saved.
+profiles-flush-restart-button = Restart { -brand-short-name }
+
+# Variables:
+#   $name (String) - Name of the profile
+profiles-name = Profile: { $name }
+profiles-is-default = Default Profile
+profiles-rootdir = Root Directory
+
+# localDir is used to show the directory corresponding to
+# the main profile directory that exists for the purpose of storing data on the
+# local filesystem, including cache files or other data files that may not
+# represent critical user data. (e.g., this directory may not be included as
+# part of a backup scheme.)
+# In case localDir and rootDir are equal, localDir is not shown.
+profiles-localdir = Local Directory
+profiles-current-profile = This is the profile in use and it cannot be deleted.
+profiles-in-use-profile = This profile is in use in another application and it cannot be deleted.
+
+profiles-rename = Rename
+profiles-remove = Remove
+profiles-set-as-default = Set as default profile
+profiles-launch-profile = Launch profile in new browser
+
+profiles-cannot-set-as-default-title = Unable to set default
+profiles-cannot-set-as-default-message = The default profile cannot be changed for { -brand-short-name }.
+
+profiles-yes = yes
+profiles-no = no
+
+profiles-rename-profile-title = Rename Profile
+# Variables:
+#   $name (String) - Name of the profile
+profiles-rename-profile = Rename profile { $name }
+
+profiles-invalid-profile-name-title = Invalid profile name
+# Variables:
+#   $name (String) - Name of the profile
+profiles-invalid-profile-name = The profile name “{ $name }” is not allowed.
+
+profiles-delete-profile-title = Delete Profile
+# Variables:
+#   $dir (String) - Path to be displayed
+profiles-delete-profile-confirm =
+    Deleting a profile will remove the profile from the list of available profiles and cannot be undone.
+    You may also choose to delete the profile data files, including your settings, certificates and other user-related data. This option will delete the folder “{ $dir }” and cannot be undone.
+    Would you like to delete the profile data files?
+profiles-delete-files = Delete Files
+profiles-dont-delete-files = Don’t Delete Files
+
+profiles-delete-profile-failed-title = Error
+profiles-delete-profile-failed-message = There was an error while attempting to delete this profile.
+
+
+profiles-opendir =
+    { PLATFORM() ->
+        [macos] Show in Finder
+        [windows] Open Folder
+       *[other] Open Directory
+    }
diff --git a/toolkit/locales/en-US/toolkit/about/aboutRights.ftl b/toolkit/locales/en-US/toolkit/about/aboutRights.ftl
new file mode 100644
index 0000000000..517e4232df
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutRights.ftl
@@ -0,0 +1,132 @@
+# 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/.
+
+rights-title = About Your Rights
+rights-intro =
+    { -brand-full-name } is free and open source software, built by a community
+    of thousands from all over the world. There are a few things you should
+    know:
+rights-intro-point-1 =
+    { -brand-short-name } is made available to you under the terms of the
+    <a data-l10n-name="mozilla-public-license-link">Mozilla Public License</a>.
+    This means you may use, copy and distribute { -brand-short-name } to
+    others. You are also welcome to modify the source code of
+    { -brand-short-name } as you want to meet your needs. The Mozilla Public
+    License also gives you the right to distribute your modified versions.
+rights-intro-point-2 =
+    You are not granted any trademark rights or licenses to the trademarks of
+    the Mozilla Foundation or any party, including without limitation the
+    Firefox name or logo. Additional information on trademarks may be found
+    <a data-l10n-name="mozilla-trademarks-link">here</a>.
+rights-intro-point-3 =
+    Some features in { -brand-short-name }, such as the Crash Reporter, give
+    you the option to provide feedback to { -vendor-short-name }. By choosing
+    to submit feedback, you give { -vendor-short-name } permission to use the
+    feedback to improve its products, to publish the feedback on its websites,
+    and to distribute the feedback.
+rights-intro-point-4 =
+    How we use your personal information and feedback submitted to
+    { -vendor-short-name } through { -brand-short-name } is described in the
+    <a data-l10n-name="mozilla-privacy-policy-link">{ -brand-short-name }
+    Privacy Policy</a>.
+rights-intro-point-4-unbranded =
+    Any applicable privacy policies for this product should be listed here.
+rights-intro-point-5 =
+    Some { -brand-short-name } features make use of web-based information
+    services, however, we cannot guarantee they are 100% accurate or
+    error-free. More details, including information on how to disable the
+    features that use these services, can be found in the
+    <a data-l10n-name="mozilla-service-terms-link">service terms</a>.
+rights-intro-point-5-unbranded =
+    If this product incorporates web services, any applicable service terms for
+    the service(s) should be linked to the
+    <a data-l10n-name="mozilla-website-services-link"> Website Services</a>
+    section.
+rights-intro-point-6 =
+    In order to play back certain types of video content, { -brand-short-name }
+    downloads certain content decryption modules from third parties.
+rights-webservices-header = { -brand-full-name } Web-Based Information Services
+rights-webservices =
+    { -brand-full-name } uses web-based information services (“Services”) to
+    provide some of the features provided for your use with this binary version
+    of { -brand-short-name } under the terms described below. If you do not
+    want to use one or more of the Services or the terms below are
+    unacceptable, you may disable the feature or Service(s). Instructions on
+    how to disable a particular feature or Service may be found
+    <a data-l10n-name="mozilla-disable-service-link">here</a>. Other features
+    and Services can be disabled in the application preferences.
+rights-safebrowsing =
+    <strong>SafeBrowsing: </strong>Disabling the Safe Browsing feature is not
+    recommended as it may result in you going to unsafe sites. If you wish to
+    disable the feature completely, follow these steps:
+rights-safebrowsing-term-1 = Open the application preferences
+rights-safebrowsing-term-2 = Select the Security selection
+rights-safebrowsing-term-3 =
+    Uncheck the option to “{ enableSafeBrowsing-label }”
+enableSafeBrowsing-label = Block dangerous and deceptive content
+rights-safebrowsing-term-4 = Safe Browsing is now disabled
+rights-locationawarebrowsing =
+    <strong>Location Aware Browsing: </strong>is always opt-in. No location
+    information is ever sent without your permission. If you wish to disable
+    the feature completely, follow these steps:
+rights-locationawarebrowsing-term-1 =
+    In the URL bar, type <code>about:config</code>
+rights-locationawarebrowsing-term-2 = Type geo.enabled
+rights-locationawarebrowsing-term-3 =
+    Double click on the geo.enabled preference
+rights-locationawarebrowsing-term-4 = Location-Aware Browsing is now disabled
+rights-webservices-unbranded =
+    An overview of the website services the product incorporates, along with
+    instructions on how to disable them, if applicable, should be included
+    here.
+rights-webservices-term-unbranded =
+    Any applicable service terms for this product should be listed here.
+rights-webservices-term-1 =
+    { -vendor-short-name } and its contributors, licensors and partners work to
+    provide the most accurate and up-to-date Services. However, we cannot
+    guarantee that this information is comprehensive and error-free. For
+    example, the Safe Browsing Service may not identify some risky sites and
+    may identify some safe sites in error and the Location Aware Service all
+    locations returned by our service providers are estimates only and neither
+    we nor our service providers guarantee the accuracy of the locations
+    provided.
+rights-webservices-term-2 =
+    { -vendor-short-name } may discontinue or change the Services at its
+    discretion.
+rights-webservices-term-3 =
+    You are welcome to use these Services with the accompanying version of
+    { -brand-short-name }, and { -vendor-short-name } grants you its rights to
+    do so. { -vendor-short-name } and its licensors reserve all other rights in
+    the Services. These terms are not intended to limit any rights granted
+    under open source licenses applicable to { -brand-short-name } and to
+    corresponding source code versions of { -brand-short-name }.
+rights-webservices-term-4 =
+    <strong>The Services are provided “as-is.” { -vendor-short-name }, its
+    contributors, licensors, and distributors, disclaim all warranties, whether
+    express or implied, including without limitation, warranties that the
+    Services are merchantable and fit for your particular purposes. You bear
+    the entire risk as to selecting the Services for your purposes and as to
+    the quality and performance of the Services. Some jurisdictions do not
+    allow the exclusion or limitation of implied warranties, so this disclaimer
+    may not apply to you.</strong>
+rights-webservices-term-5 =
+    <strong>Except as required by law, { -vendor-short-name }, its
+    contributors, licensors, and distributors will not be liable for any
+    indirect, special, incidental, consequential, punitive, or exemplary
+    damages arising out of or in any way relating to the use of
+    { -brand-short-name } and the Services. The collective liability under
+    these terms will not exceed $500 (five hundred dollars). Some jurisdictions
+    do not allow the exclusion or limitation of certain damages, so this
+    exclusion and limitation may not apply to you.</strong>
+rights-webservices-term-6 =
+    { -vendor-short-name } may update these terms as necessary from time to
+    time. These terms may not be modified or canceled without
+    { -vendor-short-name }’s written agreement.
+rights-webservices-term-7 =
+    These terms are governed by the laws of the state of California, U.S.A.,
+    excluding its conflict of law provisions. If any portion of these terms is
+    held to be invalid or unenforceable, the remaining portions will remain in
+    full force and effect. In the event of a conflict between a translated
+    version of these terms and the English language version, the English
+    language version shall control.
diff --git a/toolkit/locales/en-US/toolkit/about/aboutServiceWorkers.ftl b/toolkit/locales/en-US/toolkit/about/aboutServiceWorkers.ftl
new file mode 100644
index 0000000000..73217f24a3
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutServiceWorkers.ftl
@@ -0,0 +1,38 @@
+# 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/.
+
+### The term "Service Workers" and "Workers" should not be translated
+
+about-service-workers-title = About Service Workers
+about-service-workers-main-title = Registered Service Workers
+about-service-workers-warning-not-enabled = Service Workers are not enabled.
+about-service-workers-warning-no-service-workers = No Service Workers registered.
+
+# The original title of service workers' information
+#
+# Variables:
+#   $originTitle: original title
+origin-title = Origin: { $originTitle }
+
+## These strings are for showing the information of workers.
+##
+## Variables:
+##  $name: the name of scope, active cache, waiting cache and the push end point.
+##  $url: the url of script specification and current worker.
+scope = <strong>Scope:</strong> { $name }
+script-spec = <strong>Script Spec:</strong> <a data-l10n-name="link">{ $url }</a>
+current-worker-url = <strong>Current Worker URL:</strong> <a data-l10n-name="link">{ $url }</a>
+active-cache-name = <strong>Active Cache Name:</strong> { $name }
+waiting-cache-name = <strong>Waiting Cache Name:</strong> { $name }
+push-end-point-waiting = <strong>Push Endpoint:</strong> { waiting }
+push-end-point-result = <strong>Push Endpoint:</strong> { $name }
+
+# This term is used as a button label (verb, not noun).
+update-button = Update
+
+unregister-button = Unregister
+
+unregister-error = Failed to unregister this Service Worker.
+
+waiting = Waiting…
diff --git a/toolkit/locales/en-US/toolkit/about/aboutSupport.ftl b/toolkit/locales/en-US/toolkit/about/aboutSupport.ftl
new file mode 100644
index 0000000000..eb70ef3d8e
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutSupport.ftl
@@ -0,0 +1,403 @@
+# 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/.
+
+page-title = Troubleshooting Information
+page-subtitle =
+    This page contains technical information that might be useful when you’re
+    trying to solve a problem. If you are looking for answers to common questions
+    about { -brand-short-name }, check out our <a data-l10n-name="support-link">support website</a>.
+
+crashes-title = Crash Reports
+crashes-id = Report ID
+crashes-send-date = Submitted
+crashes-all-reports = All Crash Reports
+crashes-no-config = This application has not been configured to display crash reports.
+support-addons-title = Add-ons
+support-addons-name = Name
+support-addons-type = Type
+support-addons-enabled = Enabled
+support-addons-version = Version
+support-addons-id = ID
+security-software-title = Security Software
+security-software-type = Type
+security-software-name = Name
+security-software-antivirus = Antivirus
+security-software-antispyware = Antispyware
+security-software-firewall = Firewall
+features-title = { -brand-short-name } Features
+features-name = Name
+features-version = Version
+features-id = ID
+processes-title = Remote Processes
+processes-type = Type
+processes-count = Count
+app-basics-title = Application Basics
+app-basics-name = Name
+app-basics-version = Version
+app-basics-build-id = Build ID
+app-basics-distribution-id = Distribution ID
+app-basics-update-channel = Update Channel
+# This message refers to the folder used to store updates on the device,
+# as in "Folder for updates". "Update" is a noun, not a verb.
+app-basics-update-dir =
+    { PLATFORM() ->
+        [linux] Update Directory
+       *[other] Update Folder
+    }
+app-basics-update-history = Update History
+app-basics-show-update-history = Show Update History
+# Represents the path to the binary used to start the application.
+app-basics-binary = Application Binary
+app-basics-profile-dir =
+    { PLATFORM() ->
+        [linux] Profile Directory
+       *[other] Profile Folder
+    }
+app-basics-enabled-plugins = Enabled Plugins
+app-basics-build-config = Build Configuration
+app-basics-user-agent = User Agent
+app-basics-os = OS
+# Rosetta is Apple's translation process to run apps containing x86_64
+# instructions on Apple Silicon. This should remain in English.
+app-basics-rosetta = Rosetta Translated
+app-basics-memory-use = Memory Use
+app-basics-performance = Performance
+app-basics-service-workers = Registered Service Workers
+app-basics-profiles = Profiles
+app-basics-launcher-process-status = Launcher Process
+app-basics-multi-process-support = Multiprocess Windows
+app-basics-fission-support = Fission Windows
+app-basics-remote-processes-count = Remote Processes
+app-basics-enterprise-policies = Enterprise Policies
+app-basics-location-service-key-google = Google Location Service Key
+app-basics-safebrowsing-key-google = Google Safebrowsing Key
+app-basics-key-mozilla = Mozilla Location Service Key
+app-basics-safe-mode = Safe Mode
+show-dir-label =
+    { PLATFORM() ->
+        [macos] Show in Finder
+        [windows] Open Folder
+       *[other] Open Directory
+    }
+environment-variables-title = Environment Variables
+environment-variables-name = Name
+environment-variables-value = Value
+experimental-features-title = Experimental Features
+experimental-features-name = Name
+experimental-features-value = Value
+modified-key-prefs-title = Important Modified Preferences
+modified-prefs-name = Name
+modified-prefs-value = Value
+user-js-title = user.js Preferences
+user-js-description = Your profile folder contains a <a data-l10n-name="user-js-link">user.js file</a>, which includes preferences that were not created by { -brand-short-name }.
+locked-key-prefs-title = Important Locked Preferences
+locked-prefs-name = Name
+locked-prefs-value = Value
+graphics-title = Graphics
+graphics-features-title = Features
+graphics-diagnostics-title = Diagnostics
+graphics-failure-log-title = Failure Log
+graphics-gpu1-title = GPU #1
+graphics-gpu2-title = GPU #2
+graphics-decision-log-title = Decision Log
+graphics-crash-guards-title = Crash Guard Disabled Features
+graphics-workarounds-title = Workarounds
+# Windowing system in use on Linux (e.g. X11, Wayland).
+graphics-window-protocol = Window Protocol
+# Desktop environment in use on Linux (e.g. GNOME, KDE, XFCE, etc).
+graphics-desktop-environment = Desktop Environment
+place-database-title = Places Database
+place-database-integrity = Integrity
+place-database-verify-integrity = Verify Integrity
+a11y-title = Accessibility
+a11y-activated = Activated
+a11y-force-disabled = Prevent Accessibility
+a11y-handler-used = Accessible Handler Used
+a11y-instantiator = Accessibility Instantiator
+library-version-title = Library Versions
+copy-text-to-clipboard-label = Copy text to clipboard
+copy-raw-data-to-clipboard-label = Copy raw data to clipboard
+sandbox-title = Sandbox
+sandbox-sys-call-log-title = Rejected System Calls
+sandbox-sys-call-index = #
+sandbox-sys-call-age = Seconds Ago
+sandbox-sys-call-pid = PID
+sandbox-sys-call-tid = TID
+sandbox-sys-call-proc-type = Process Type
+sandbox-sys-call-number = Syscall
+sandbox-sys-call-args = Arguments
+safe-mode-title = Try Safe Mode
+restart-in-safe-mode-label = Restart with Add-ons Disabled…
+clear-startup-cache-title = Try clearing the startup cache
+clear-startup-cache-label = Clear startup cache…
+startup-cache-dialog-title = Clear startup cache
+startup-cache-dialog-body = Restart { -brand-short-name } to clear startup cache. This will not change your settings or remove extensions you’ve added to { -brand-short-name }.
+restart-button-label = Restart
+
+## Media titles
+
+audio-backend = Audio Backend
+max-audio-channels = Max Channels
+sample-rate = Preferred Sample Rate
+roundtrip-latency = Roundtrip latency (standard deviation)
+media-title = Media
+media-output-devices-title = Output Devices
+media-input-devices-title = Input Devices
+media-device-name = Name
+media-device-group = Group
+media-device-vendor = Vendor
+media-device-state = State
+media-device-preferred = Preferred
+media-device-format = Format
+media-device-channels = Channels
+media-device-rate = Rate
+media-device-latency = Latency
+media-capabilities-title = Media Capabilities
+# List all the entries of the database.
+media-capabilities-enumerate = Enumerate database
+##
+
+intl-title = Internationalization & Localization
+intl-app-title = Application Settings
+intl-locales-requested = Requested Locales
+intl-locales-available = Available Locales
+intl-locales-supported = App Locales
+intl-locales-default = Default Locale
+intl-os-title = Operating System
+intl-os-prefs-system-locales = System Locales
+intl-regional-prefs = Regional Preferences
+
+## Remote Debugging
+##
+## The Firefox remote protocol provides low-level debugging interfaces
+## used to inspect state and control execution of documents,
+## browser instrumentation, user interaction simulation,
+## and for subscribing to browser-internal events.
+##
+## See also https://firefox-source-docs.mozilla.org/remote/
+
+remote-debugging-title = Remote Debugging (Chromium Protocol)
+remote-debugging-accepting-connections = Accepting Connections
+remote-debugging-url = URL
+##
+
+support-third-party-modules-title = Third-Party Modules
+support-third-party-modules-module = Module File
+support-third-party-modules-version = File Version
+support-third-party-modules-vendor = Vendor Info
+support-third-party-modules-occurrence = Occurrence
+support-third-party-modules-process = Process Type & ID
+support-third-party-modules-thread = Thread
+support-third-party-modules-base = Imagebase Address
+support-third-party-modules-uptime = Process Uptime (ms)
+support-third-party-modules-duration = Loading Duration (ms)
+support-third-party-modules-status = Status
+support-third-party-modules-status-loaded = Loaded
+support-third-party-modules-status-blocked = Blocked
+support-third-party-modules-status-redirected = Redirected
+support-third-party-modules-empty = No third-party modules were loaded.
+support-third-party-modules-no-value = (No value)
+support-third-party-modules-button-open =
+    .title = Open file location…
+support-third-party-modules-expand =
+    .title = Show detailed information
+support-third-party-modules-collapse =
+    .title = Collapse detailed information
+support-third-party-modules-unsigned-icon =
+    .title = This module is not signed
+support-third-party-modules-folder-icon =
+    .title = Open file location…
+support-third-party-modules-down-icon =
+    .title = Show detailed information
+support-third-party-modules-up-icon =
+    .title = Collapse detailed information
+
+# Variables
+# $days (Integer) - Number of days of crashes to log
+report-crash-for-days =
+    { $days ->
+        [one] Crash Reports for the Last { $days } Day
+       *[other] Crash Reports for the Last { $days } Days
+    }
+
+# Variables
+# $minutes (integer) - Number of minutes since crash
+crashes-time-minutes =
+    { $minutes ->
+        [one] { $minutes } minute ago
+       *[other] { $minutes } minutes ago
+    }
+
+# Variables
+# $hours (integer) - Number of hours since crash
+crashes-time-hours =
+    { $hours ->
+        [one] { $hours } hour ago
+       *[other] { $hours } hours ago
+    }
+
+# Variables
+# $days (integer) - Number of days since crash
+crashes-time-days =
+    { $days ->
+        [one] { $days } day ago
+       *[other] { $days } days ago
+    }
+
+# Variables
+# $reports (integer) - Number of pending reports
+pending-reports =
+    { $reports ->
+        [one] All Crash Reports (including { $reports } pending crash in the given time range)
+       *[other] All Crash Reports (including { $reports } pending crashes in the given time range)
+    }
+
+raw-data-copied = Raw data copied to clipboard
+text-copied = Text copied to clipboard
+
+## The verb "blocked" here refers to a graphics feature such as "Direct2D" or "OpenGL layers".
+blocked-driver = Blocked for your graphics driver version.
+blocked-gfx-card = Blocked for your graphics card because of unresolved driver issues.
+blocked-os-version = Blocked for your operating system version.
+blocked-mismatched-version = Blocked for your graphics driver version mismatch between registry and DLL.
+# Variables
+# $driverVersion - The graphics driver version string
+try-newer-driver = Blocked for your graphics driver version. Try updating your graphics driver to version { $driverVersion } or newer.
+
+# "ClearType" is a proper noun and should not be translated. Feel free to leave English strings if
+# there are no good translations, these are only used in about:support
+clear-type-parameters = ClearType Parameters
+
+compositing = Compositing
+hardware-h264 = Hardware H264 Decoding
+main-thread-no-omtc = main thread, no OMTC
+yes = Yes
+no = No
+unknown = Unknown
+virtual-monitor-disp = Virtual Monitor Display
+
+## The following strings indicate if an API key has been found.
+## In some development versions, it's expected for some API keys that they are
+## not found.
+found = Found
+missing = Missing
+
+gpu-process-pid = GPUProcessPid
+gpu-process = GPUProcess
+gpu-description = Description
+gpu-vendor-id = Vendor ID
+gpu-device-id = Device ID
+gpu-subsys-id = Subsys ID
+gpu-drivers = Drivers
+gpu-ram = RAM
+gpu-driver-vendor = Driver Vendor
+gpu-driver-version = Driver Version
+gpu-driver-date = Driver Date
+gpu-active = Active
+webgl1-wsiinfo = WebGL 1 Driver WSI Info
+webgl1-renderer = WebGL 1 Driver Renderer
+webgl1-version = WebGL 1 Driver Version
+webgl1-driver-extensions = WebGL 1 Driver Extensions
+webgl1-extensions = WebGL 1 Extensions
+webgl2-wsiinfo = WebGL 2 Driver WSI Info
+webgl2-renderer = WebGL 2 Driver Renderer
+webgl2-version = WebGL 2 Driver Version
+webgl2-driver-extensions = WebGL 2 Driver Extensions
+webgl2-extensions = WebGL 2 Extensions
+
+# Variables
+#   $bugNumber (string) - Bug number on Bugzilla
+support-blocklisted-bug = Blocklisted due to known issues: <a data-l10n-name="bug-link">bug { $bugNumber }</a>
+
+# Variables
+# $failureCode (string) - String that can be searched in the source tree.
+unknown-failure = Blocklisted; failure code { $failureCode }
+
+d3d11layers-crash-guard = D3D11 Compositor
+glcontext-crash-guard = OpenGL
+wmfvpxvideo-crash-guard = WMF VPX Video Decoder
+
+reset-on-next-restart = Reset on Next Restart
+gpu-process-kill-button = Terminate GPU Process
+gpu-device-reset = Device Reset
+gpu-device-reset-button = Trigger Device Reset
+uses-tiling = Uses Tiling
+content-uses-tiling = Uses Tiling (Content)
+off-main-thread-paint-enabled = Off Main Thread Painting Enabled
+off-main-thread-paint-worker-count = Off Main Thread Painting Worker Count
+target-frame-rate = Target Frame Rate
+
+min-lib-versions = Expected minimum version
+loaded-lib-versions = Version in use
+
+has-seccomp-bpf = Seccomp-BPF (System Call Filtering)
+has-seccomp-tsync = Seccomp Thread Synchronization
+has-user-namespaces = User Namespaces
+has-privileged-user-namespaces = User Namespaces for privileged processes
+can-sandbox-content = Content Process Sandboxing
+can-sandbox-media = Media Plugin Sandboxing
+content-sandbox-level = Content Process Sandbox Level
+effective-content-sandbox-level = Effective Content Process Sandbox Level
+sandbox-proc-type-content = content
+sandbox-proc-type-file = file content
+sandbox-proc-type-media-plugin = media plugin
+sandbox-proc-type-data-decoder = data decoder
+
+startup-cache-title = Startup Cache
+startup-cache-disk-cache-path = Disk Cache Path
+startup-cache-ignore-disk-cache = Ignore Disk Cache
+startup-cache-found-disk-cache-on-init = Found Disk Cache on Init
+startup-cache-wrote-to-disk-cache = Wrote to Disk Cache
+
+launcher-process-status-0 = Enabled
+launcher-process-status-1 = Disabled due to failure
+launcher-process-status-2 = Disabled forcibly
+launcher-process-status-unknown = Unknown status
+
+# Variables
+# $remoteWindows (integer) - Number of remote windows
+# $totalWindows (integer) - Number of total windows
+multi-process-windows = { $remoteWindows }/{ $totalWindows }
+# Variables
+# $fissionWindows (integer) - Number of remote windows
+# $totalWindows (integer) - Number of total windows
+fission-windows = { $fissionWindows }/{ $totalWindows }
+fission-status-experiment-control = Disabled by experiment
+fission-status-experiment-treatment = Enabled by experiment
+fission-status-disabled-by-e10s-env = Disabled by environment
+fission-status-enabled-by-env = Enabled by environment
+fission-status-disabled-by-safe-mode = Disabled by safe mode
+fission-status-enabled-by-default = Enabled by default
+fission-status-disabled-by-default = Disabled by default
+fission-status-enabled-by-user-pref = Enabled by user
+fission-status-disabled-by-user-pref = Disabled by user
+fission-status-disabled-by-e10s-other = E10s disabled
+
+async-pan-zoom = Asynchronous Pan/Zoom
+apz-none = none
+wheel-enabled = wheel input enabled
+touch-enabled = touch input enabled
+drag-enabled = scrollbar drag enabled
+keyboard-enabled = keyboard enabled
+autoscroll-enabled = autoscroll enabled
+zooming-enabled = smooth pinch-zoom enabled
+
+## Variables
+## $preferenceKey (string) - String ID of preference
+wheel-warning = async wheel input disabled due to unsupported pref: { $preferenceKey }
+touch-warning = async touch input disabled due to unsupported pref: { $preferenceKey }
+
+## Strings representing the status of the Enterprise Policies engine.
+policies-inactive = Inactive
+policies-active = Active
+policies-error = Error
+
+## Printing section
+
+support-printing-title = Printing
+support-printing-troubleshoot = Troubleshooting
+support-printing-clear-settings-button = Clear saved print settings
+support-printing-modified-settings = Modified print settings
+support-printing-prefs-name = Name
+support-printing-prefs-value = Value
diff --git a/toolkit/locales/en-US/toolkit/about/aboutTelemetry.ftl b/toolkit/locales/en-US/toolkit/about/aboutTelemetry.ftl
new file mode 100644
index 0000000000..009c862b44
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/aboutTelemetry.ftl
@@ -0,0 +1,147 @@
+# 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/.
+
+about-telemetry-ping-data-source = Ping data source:
+about-telemetry-show-current-data = Current data
+about-telemetry-show-archived-ping-data = Archived ping data
+about-telemetry-show-subsession-data = Show subsession data
+about-telemetry-choose-ping = Choose ping:
+about-telemetry-archive-ping-type = Ping Type
+about-telemetry-archive-ping-header = Ping
+about-telemetry-option-group-today = Today
+about-telemetry-option-group-yesterday = Yesterday
+about-telemetry-option-group-older = Older
+about-telemetry-previous-ping = <<
+about-telemetry-next-ping = >>
+about-telemetry-page-title = Telemetry Data
+about-telemetry-current-store = Current Store:
+about-telemetry-more-information = Looking for more information?
+about-telemetry-firefox-data-doc = The <a data-l10n-name="data-doc-link">Firefox Data Documentation</a> contains guides about how to work with our data tools.
+about-telemetry-telemetry-client-doc = The <a data-l10n-name="client-doc-link">Firefox Telemetry client documentation</a> includes definitions for concepts, API documentation and data references.
+about-telemetry-telemetry-dashboard = The <a data-l10n-name="dashboard-link">Telemetry dashboards</a> allow you to visualize the data Mozilla receives via Telemetry.
+about-telemetry-telemetry-probe-dictionary = The <a data-l10n-name="probe-dictionary-link">Probe Dictionary</a> provides details and descriptions for the probes collected by Telemetry.
+about-telemetry-show-in-Firefox-json-viewer = Open in the JSON viewer
+about-telemetry-home-section = Home
+about-telemetry-general-data-section = General Data
+about-telemetry-environment-data-section = Environment Data
+about-telemetry-session-info-section = Session Information
+about-telemetry-scalar-section = Scalars
+about-telemetry-keyed-scalar-section = Keyed Scalars
+about-telemetry-histograms-section = Histograms
+about-telemetry-keyed-histogram-section = Keyed Histograms
+about-telemetry-events-section = Events
+about-telemetry-simple-measurements-section = Simple Measurements
+about-telemetry-slow-sql-section = Slow SQL Statements
+about-telemetry-addon-details-section = Add-on Details
+about-telemetry-captured-stacks-section = Captured Stacks
+about-telemetry-late-writes-section = Late Writes
+about-telemetry-raw-payload-section = Raw Payload
+about-telemetry-raw = Raw JSON
+about-telemetry-full-sql-warning = NOTE: Slow SQL debugging is enabled. Full SQL strings may be displayed below but they will not be submitted to Telemetry.
+about-telemetry-fetch-stack-symbols = Fetch function names for stacks
+about-telemetry-hide-stack-symbols = Show raw stack data
+# Selects the correct release version
+# Variables:
+#   $channel (String): represents the corresponding release data string
+about-telemetry-data-type =
+    { $channel ->
+        [release] release data
+       *[prerelease] pre-release data
+    }
+# Selects the correct upload string
+# Variables:
+#   $uploadcase (String): represents a corresponding upload string
+about-telemetry-upload-type =
+    { $uploadcase ->
+        [enabled] enabled
+       *[disabled] disabled
+    }
+# Example Output: 1 sample, average = 0, sum = 0
+# Variables:
+#   $sampleCount (Integer): amount of histogram samples
+#   $prettyAverage (Integer): average of histogram samples
+#   $sum (Integer): sum of histogram samples
+about-telemetry-histogram-stats =
+    { $sampleCount ->
+        [one] { $sampleCount } sample, average = { $prettyAverage }, sum = { $sum }
+       *[other] { $sampleCount } samples, average = { $prettyAverage }, sum = { $sum }
+    }
+# Variables:
+#   $telemetryServerOwner (String): the value of the toolkit.telemetry.server_owner preference. Typically "Mozilla"
+about-telemetry-page-subtitle = This page shows the information about performance, hardware, usage and customizations collected by Telemetry. This information is submitted to { $telemetryServerOwner } to help improve { -brand-full-name }.
+about-telemetry-settings-explanation = Telemetry is collecting { about-telemetry-data-type } and upload is <a data-l10n-name="upload-link">{ about-telemetry-upload-type }</a>.
+# Variables:
+#   $name (String): ping name, e.g. “saved-session”
+#   $timeStamp (String): ping localized timestamp, e.g. “2017/07/08 10:40:46”
+about-telemetry-ping-details = Each piece of information is sent bundled into “<a data-l10n-name="ping-link">pings</a>”. You are looking at the { $name }, { $timestamp } ping.
+about-telemetry-data-details-current = Each piece of information is sent bundled into “<a data-l10n-name="ping-link">pings</a>“. You are looking at the current data.
+# string used as a placeholder for the search field
+# More info about it can be found here:
+# https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/data/main-ping.html
+# Variables:
+#   $selectedTitle (String): the section name from the structure of the ping.
+about-telemetry-filter-placeholder =
+    .placeholder = Find in { $selectedTitle }
+about-telemetry-filter-all-placeholder =
+    .placeholder = Find in all sections
+# Variables:
+#   $searchTerms (String): the searched terms
+about-telemetry-results-for-search = Results for “{ $searchTerms }”
+# More info about it can be found here: https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/data/main-ping.html
+# Variables:
+#   $sectionName (String): the section name from the structure of the ping.
+#   $currentSearchText (String): the current text in the search input
+about-telemetry-no-search-results = Sorry! There are no results in { $sectionName } for “{ $currentSearchText }”
+# Variables:
+#   $searchTerms (String): the searched terms
+about-telemetry-no-search-results-all = Sorry! There are no results in any sections for “{ $searchTerms }”
+# This message is displayed when a section is empty.
+# Variables:
+#   $sectionName (String): is replaced by the section name.
+about-telemetry-no-data-to-display = Sorry! There is currently no data available in “{ $sectionName }”
+# used as a tooltip for the “current” ping title in the sidebar
+about-telemetry-current-data-sidebar = current data
+# used in the “Ping Type” select
+about-telemetry-telemetry-ping-type-all = all
+# button label to copy the histogram
+about-telemetry-histogram-copy = Copy
+# these strings are used in the “Slow SQL Statements” section
+about-telemetry-slow-sql-main = Slow SQL Statements on Main Thread
+about-telemetry-slow-sql-other = Slow SQL Statements on Helper Threads
+about-telemetry-slow-sql-hits = Hits
+about-telemetry-slow-sql-average = Avg. Time (ms)
+about-telemetry-slow-sql-statement = Statement
+# these strings are used in the “Add-on Details” section
+about-telemetry-addon-table-id = Add-on ID
+about-telemetry-addon-table-details = Details
+# Variables:
+#   $addonProvider (String): the name of an Add-on Provider (e.g. “XPI”, “Plugin”)
+about-telemetry-addon-provider = { $addonProvider } Provider
+about-telemetry-keys-header = Property
+about-telemetry-names-header = Name
+about-telemetry-values-header = Value
+# Variables:
+#   $stackKey (String): the string key for this stack
+#   $capturedStacksCount (Integer):  the number of times this stack was captured
+about-telemetry-captured-stacks-title = { $stackKey } (capture count: { $capturedStacksCount })
+# Variables:
+#   $lateWriteCount (Integer): the number of the late writes
+about-telemetry-late-writes-title = Late Write #{ $lateWriteCount }
+about-telemetry-stack-title = Stack:
+about-telemetry-memory-map-title = Memory map:
+about-telemetry-error-fetching-symbols = An error occurred while fetching symbols. Check that you are connected to the Internet and try again.
+about-telemetry-time-stamp-header = timestamp
+about-telemetry-category-header = category
+about-telemetry-method-header = method
+about-telemetry-object-header = object
+about-telemetry-extra-header = extra
+about-telemetry-origin-section = Origin Telemetry
+about-telemetry-origin-origin = origin
+about-telemetry-origin-count = count
+# Variables:
+#   $telemetryServerOwner (String): the value of the toolkit.telemetry.server_owner preference. Typically "Mozilla"
+about-telemetry-origins-explanation = <a data-l10n-name="origin-doc-link">Firefox Origin Telemetry</a> encodes data before it is sent so that { $telemetryServerOwner } can count things, but not know whether or not any given { -brand-product-name } contributed to that count. (<a data-l10n-name="prio-blog-link">learn more</a>)
+# Variables:
+#  $process (String): type of process in subsection headers ( e.g. "content", "parent" )
+about-telemetry-process = { $process } process
diff --git a/toolkit/locales/en-US/toolkit/about/abuseReports.ftl b/toolkit/locales/en-US/toolkit/about/abuseReports.ftl
new file mode 100644
index 0000000000..22e1bc2850
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/abuseReports.ftl
@@ -0,0 +1,98 @@
+# 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/.
+
+# Localized string used as the dialog window title.
+# "Report" is a noun in this case, "Report for AddonName".
+#
+# Variables:
+#   $addon-name (string) - Name of the add-on being reported
+abuse-report-dialog-title = Report for { $addon-name }
+
+abuse-report-title-extension = Report This Extension to { -vendor-short-name }
+abuse-report-title-theme = Report This Theme to { -vendor-short-name }
+abuse-report-subtitle = What’s the issue?
+
+# Variables:
+#   $author-name (string) - Name of the add-on author
+abuse-report-addon-authored-by = by <a data-l10n-name="author-name">{ $author-name }</a>
+
+abuse-report-learnmore =
+  Unsure what issue to select?
+  <a data-l10n-name="learnmore-link">Learn more about reporting extensions and themes</a>
+
+abuse-report-submit-description = Describe the problem (optional)
+abuse-report-textarea =
+  .placeholder = It’s easier for us to address a problem if we have specifics. Please describe what you’re experiencing. Thank you for helping us keep the web healthy.
+abuse-report-submit-note =
+  Note: Don’t include personal information (such as name, email address, phone number, physical address).
+  { -vendor-short-name } keeps a permanent record of these reports.
+
+## Panel buttons.
+
+abuse-report-cancel-button = Cancel
+abuse-report-next-button = Next
+abuse-report-goback-button = Go back
+abuse-report-submit-button = Submit
+
+## Message bars descriptions.
+
+## Variables:
+##   $addon-name (string) - Name of the add-on
+abuse-report-messagebar-aborted = Report for <span data-l10n-name="addon-name">{ $addon-name }</span> canceled.
+abuse-report-messagebar-submitting = Sending report for <span data-l10n-name="addon-name">{ $addon-name }</span>.
+abuse-report-messagebar-submitted = Thank you for submitting a report. Do you want to remove <span data-l10n-name="addon-name">{ $addon-name }</span>?
+abuse-report-messagebar-submitted-noremove = Thank you for submitting a report.
+abuse-report-messagebar-removed-extension = Thank you for submitting a report. You’ve removed the extension <span data-l10n-name="addon-name">{ $addon-name }</span>.
+abuse-report-messagebar-removed-theme = Thank you for submitting a report. You’ve removed the theme <span data-l10n-name="addon-name">{ $addon-name }</span>.
+abuse-report-messagebar-error = There was an error sending the report for <span data-l10n-name="addon-name">{ $addon-name }</span>.
+abuse-report-messagebar-error-recent-submit = The report for <span data-l10n-name="addon-name">{ $addon-name }</span> wasn’t sent because another report was submitted recently.
+
+## Message bars actions.
+
+abuse-report-messagebar-action-remove-extension = Yes, Remove It
+abuse-report-messagebar-action-keep-extension = No, I’ll Keep It
+abuse-report-messagebar-action-remove-theme = Yes, Remove It
+abuse-report-messagebar-action-keep-theme = No, I’ll Keep It
+abuse-report-messagebar-action-retry = Retry
+abuse-report-messagebar-action-cancel = Cancel
+
+## Abuse report reasons (optionally paired with related examples and/or suggestions)
+
+abuse-report-damage-reason-v2 = It damaged my computer or compromised my data
+abuse-report-damage-example = Example: Injected malware or stole data
+
+abuse-report-spam-reason-v2 = It contains spam or inserts unwanted advertising
+abuse-report-spam-example = Example: Insert ads on webpages
+
+abuse-report-settings-reason-v2 = It changed my search engine, homepage, or new tab without informing or asking me
+abuse-report-settings-suggestions = Before reporting the extension, you can try changing your settings:
+abuse-report-settings-suggestions-search = Change your default search settings
+abuse-report-settings-suggestions-homepage = Change your homepage and new tab
+
+abuse-report-deceptive-reason-v2 = It claims to be something it’s not
+abuse-report-deceptive-example = Example: Misleading description or imagery
+
+abuse-report-broken-reason-extension-v2 = It doesn’t work, breaks websites, or slows down { -brand-product-name }
+abuse-report-broken-reason-theme-v2 = It doesn’t work or breaks browser display
+abuse-report-broken-example =
+  Example: Features are slow, hard to use, or don’t work; parts of websites won’t load or look unusual
+abuse-report-broken-suggestions-extension =
+  It sounds like you’ve identified a bug. In addition to submitting a report here, the best way
+  to get a functionality issue resolved is to contact the extension developer.
+  <a data-l10n-name="support-link">Visit the extension’s website</a> to get the developer information.
+abuse-report-broken-suggestions-theme =
+  It sounds like you’ve identified a bug. In addition to submitting a report here, the best way
+  to get a functionality issue resolved is to contact the theme developer.
+  <a data-l10n-name="support-link">Visit the theme’s website</a> to get the developer information.
+
+abuse-report-policy-reason-v2 = It contains hateful, violent, or illegal content
+abuse-report-policy-suggestions =
+  Note: Copyright and trademark issues must be reported in a separate process.
+  <a data-l10n-name="report-infringement-link">Use these instructions</a> to
+  report the problem.
+
+abuse-report-unwanted-reason-v2 = I never wanted it and don’t know how to get rid of it
+abuse-report-unwanted-example = Example: An application installed it without my permission
+
+abuse-report-other-reason = Something else
diff --git a/toolkit/locales/en-US/toolkit/about/certviewer.ftl b/toolkit/locales/en-US/toolkit/about/certviewer.ftl
new file mode 100644
index 0000000000..9979172593
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/certviewer.ftl
@@ -0,0 +1,121 @@
+# 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/.
+
+certificate-viewer-certificate-section-title = Certificate
+
+## Error messages
+
+certificate-viewer-error-message = We were unable to find the certificate information, or the certificate is corrupted. Please try again.
+certificate-viewer-error-title = Something went wrong.
+
+## Certificate information labels
+
+certificate-viewer-algorithm = Algorithm
+certificate-viewer-certificate-authority = Certificate Authority
+certificate-viewer-cipher-suite = Cipher Suite
+certificate-viewer-common-name = Common Name
+certificate-viewer-email-address = Email Address
+# Variables:
+#   $firstCertName (String) - Common Name for the displayed certificate
+certificate-viewer-tab-title = Certificate for { $firstCertName }
+# Inc. means Incorporated, e.g GitHub is incorporated in Delaware
+certificate-viewer-inc-country = Inc. Country
+certificate-viewer-country = Country
+certificate-viewer-curve = Curve
+certificate-viewer-distribution-point = Distribution Point
+certificate-viewer-dns-name = DNS Name
+certificate-viewer-ip-address = IP Address
+certificate-viewer-other-name = Other Name
+certificate-viewer-exponent = Exponent
+certificate-viewer-id = ID
+certificate-viewer-key-exchange-group = Key Exchange Group
+certificate-viewer-key-id = Key ID
+certificate-viewer-key-size = Key Size
+# Inc. means Incorporated, e.g GitHub is incorporated in Delaware
+certificate-viewer-inc-locality = Inc. Locality
+certificate-viewer-locality = Locality
+certificate-viewer-location = Location
+certificate-viewer-logid = Log ID
+certificate-viewer-method = Method
+certificate-viewer-modulus = Modulus
+certificate-viewer-name = Name
+certificate-viewer-not-after = Not After
+certificate-viewer-not-before = Not Before
+certificate-viewer-organization = Organization
+certificate-viewer-organizational-unit = Organizational Unit
+certificate-viewer-policy = Policy
+certificate-viewer-protocol = Protocol
+certificate-viewer-public-value = Public Value
+certificate-viewer-purposes = Purposes
+certificate-viewer-qualifier = Qualifier
+certificate-viewer-qualifiers = Qualifiers
+certificate-viewer-required = Required
+certificate-viewer-unsupported = &lt;unsupported&gt;
+# Inc. means Incorporated, e.g GitHub is incorporated in Delaware
+certificate-viewer-inc-state-province = Inc. State/Province
+certificate-viewer-state-province = State/Province
+certificate-viewer-sha-1 = SHA-1
+certificate-viewer-sha-256 = SHA-256
+certificate-viewer-serial-number = Serial Number
+certificate-viewer-signature-algorithm = Signature Algorithm
+certificate-viewer-signature-scheme = Signature Scheme
+certificate-viewer-timestamp = Timestamp
+certificate-viewer-value = Value
+certificate-viewer-version = Version
+certificate-viewer-business-category = Business Category
+certificate-viewer-subject-name = Subject Name
+certificate-viewer-issuer-name = Issuer Name
+certificate-viewer-validity = Validity
+certificate-viewer-subject-alt-names = Subject Alt Names
+certificate-viewer-public-key-info = Public Key Info
+certificate-viewer-miscellaneous = Miscellaneous
+certificate-viewer-fingerprints = Fingerprints
+certificate-viewer-basic-constraints = Basic Constraints
+certificate-viewer-key-usages = Key Usages
+certificate-viewer-extended-key-usages = Extended Key Usages
+certificate-viewer-ocsp-stapling = OCSP Stapling
+certificate-viewer-subject-key-id = Subject Key ID
+certificate-viewer-authority-key-id = Authority Key ID
+certificate-viewer-authority-info-aia = Authority Info (AIA)
+certificate-viewer-certificate-policies = Certificate Policies
+certificate-viewer-embedded-scts = Embedded SCTs
+certificate-viewer-crl-endpoints = CRL Endpoints
+
+# This message is used as a row header in the Miscellaneous section.
+# The associated data cell contains links to download the certificate.
+certificate-viewer-download = Download
+# This message is used to replace boolean values (true/false) in several certificate fields, e.g. Certificate Authority
+# Variables:
+#   $boolean (String) - true/false value for the specific field
+certificate-viewer-boolean = { $boolean ->
+  [true] Yes
+ *[false] No
+}
+
+## Variables:
+##   $fileName (String) - The file name to save the PEM data in, derived from the common name from the certificate being displayed.
+
+certificate-viewer-download-pem = PEM (cert)
+  .download = { $fileName }.pem
+certificate-viewer-download-pem-chain = PEM (chain)
+  .download = { $fileName }-chain.pem
+
+# The title attribute for Critical Extension icon
+certificate-viewer-critical-extension =
+  .title = This extension has been marked as critical, meaning that clients must reject the certificate if they do not understand it.
+certificate-viewer-export = Export
+  .download = { $fileName }.pem
+
+##
+
+# Label for a tab where we haven't found a better label:
+certificate-viewer-unknown-group-label = (unknown)
+
+## Labels for tabs displayed in stand-alone about:certificate page
+
+certificate-viewer-tab-mine = Your Certificates
+certificate-viewer-tab-people = People
+certificate-viewer-tab-servers = Servers
+certificate-viewer-tab-ca = Authorities
+certificate-viewer-tab-unkonwn = Unknown
diff --git a/toolkit/locales/en-US/toolkit/about/url-classifier.ftl b/toolkit/locales/en-US/toolkit/about/url-classifier.ftl
new file mode 100644
index 0000000000..4a4b6ce562
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/about/url-classifier.ftl
@@ -0,0 +1,54 @@
+# 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/.
+
+url-classifier-title = URL Classifier Information
+url-classifier-search-title = Search
+url-classifier-search-result-title = Results
+url-classifier-search-result-uri = URI: { $uri }
+url-classifier-search-result-list = List of tables: { $list }
+url-classifier-search-input = URL
+url-classifier-search-error-invalid-url = Invalid URL
+url-classifier-search-error-no-features = No features selected
+url-classifier-search-btn = Start searching
+url-classifier-search-features = Features
+url-classifier-search-listType = List type
+url-classifier-provider-title = Provider
+url-classifier-provider = Provider
+url-classifier-provider-last-update-time = Last update time
+url-classifier-provider-next-update-time = Next update time
+url-classifier-provider-back-off-time = Back-off time
+url-classifier-provider-last-update-status = Last update status
+url-classifier-provider-update-btn = Update
+url-classifier-cache-title = Cache
+url-classifier-cache-refresh-btn = Refresh
+url-classifier-cache-clear-btn = Clear
+url-classifier-cache-table-name = Table name
+url-classifier-cache-ncache-entries = Number of negative cache entries
+url-classifier-cache-pcache-entries = Number of positive cache entries
+url-classifier-cache-show-entries = Show entries
+url-classifier-cache-entries = Cache Entries
+url-classifier-cache-prefix = Prefix
+url-classifier-cache-ncache-expiry = Negative cache expiry
+url-classifier-cache-fullhash = Full hash
+url-classifier-cache-pcache-expiry = Positive cache expiry
+url-classifier-debug-title = Debug
+url-classifier-debug-module-btn = Set Log Modules
+url-classifier-debug-file-btn = Set Log File
+url-classifier-debug-js-log-chk = Set JS Log
+url-classifier-debug-sb-modules = Safe Browsing log modules
+url-classifier-debug-modules = Current log modules
+url-classifier-debug-sbjs-modules = Safe Browsing JS log
+url-classifier-debug-file = Current log file
+
+url-classifier-trigger-update = Trigger Update
+url-classifier-not-available = N/A
+url-classifier-disable-sbjs-log = Disable Safe Browsing JS Log
+url-classifier-enable-sbjs-log = Enable Safe Browsing JS Log
+url-classifier-enabled = Enabled
+url-classifier-disabled = Disabled
+url-classifier-updating = updating
+url-classifier-cannot-update = cannot update
+url-classifier-success = success
+url-classifier-update-error = update error ({ $error })
+url-classifier-download-error = download error ({ $error })
diff --git a/toolkit/locales/en-US/toolkit/extensions/blocklist.ftl b/toolkit/locales/en-US/toolkit/extensions/blocklist.ftl
new file mode 100644
index 0000000000..d1ad16bd6f
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/extensions/blocklist.ftl
@@ -0,0 +1,22 @@
+# 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
+
+blocklist-window =
+  .title = Add-ons may be causing problems
+  .style = width: 45em; height: 30em
+blocklist-accept =
+  .label = Restart { -brand-short-name }
+  .accesskey = R
+
+blocklist-label-summary = { -brand-short-name } has determined that the following add-ons are known to cause stability or security problems:
+blocklist-soft-and-hard = The add-ons that have a high risk of causing stability or security problems have been blocked. The others are lower risk, but it is highly recommended that you restart with them disabled.
+blocklist-hard-blocked = These add-ons have a high risk of causing stability or security problems and have been blocked, but a restart is required to disable them completely.
+blocklist-soft-blocked = For your protection, it is highly recommended that you restart with these add-ons disabled.
+blocklist-more-information =
+  .value = More information
+
+blocklist-blocked =
+  .label = Blocked
+blocklist-checkbox =
+  .label = Disable
diff --git a/toolkit/locales/en-US/toolkit/featuregates/features.ftl b/toolkit/locales/en-US/toolkit/featuregates/features.ftl
new file mode 100644
index 0000000000..f1ba75be14
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/featuregates/features.ftl
@@ -0,0 +1,124 @@
+# 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/.
+
+# The title of the experiment should be kept in English as it may be referenced
+# by various online articles and is technical in nature.
+experimental-features-css-masonry2 =
+    .label = CSS: Masonry Layout
+experimental-features-css-masonry-description = Enables support for the experimental CSS Masonry Layout feature. See the <a data-l10n-name="explainer">explainer</a> for a high level description of the feature. To provide feedback, please comment in <a data-l10n-name="w3c-issue">this GitHub issue</a> or <a data-l10n-name="bug">this bug</a>.
+
+# The title of the experiment should be kept in English as it may be referenced
+# by various online articles and is technical in nature.
+experimental-features-web-gpu2 =
+    .label = Web API: WebGPU
+experimental-features-web-gpu-description2 = This new API provides low-level support for performing computation and graphics rendering using the <a data-l10n-name="wikipedia">Graphics Processing Unit (GPU)</a> of the user’s device or computer. The <a data-l10n-name="spec">specification</a> is still a work-in-progress. See <a data-l10n-name="bugzilla">bug 1602129</a> for more details.
+
+# The title of the experiment should be kept in English as it may be referenced
+# by various online articles and is technical in nature.
+experimental-features-media-avif =
+    .label = Media: AVIF
+experimental-features-media-avif-description = With this feature enabled, { -brand-short-name } supports the AV1 Image File (AVIF) format. This is a still image file format that leverages the capabilities of the AV1 video compression algorithms to reduce image size. See <a data-l10n-name="bugzilla">bug 1443863</a> for more details.
+
+# The title of the experiment should be kept in English as it may be referenced
+# by various online articles and is technical in nature.
+experimental-features-web-api-inputmode =
+    .label = Web API: inputmode
+# "inputmode" and "contenteditable" are technical terms and shouldn't be translated.
+experimental-features-web-api-inputmode-description = Our implementation of the <a data-l10n-name="mdn-inputmode">inputmode</a> global attribute has been updated as per <a data-l10n-name="whatwg">the WHATWG specification</a>, but we still need to make other changes too, like making it available on contenteditable content. See <a data-l10n-name="bugzilla">bug 1205133</a> for more details.
+
+# The title of the experiment should be kept in English as it may be referenced
+# by various online articles and is technical in nature.
+experimental-features-web-api-link-preload =
+    .label = Web API: <link rel="preload">
+# Do not translate "rel", "preload" or "link" here, as they are all HTML spec
+# values that do not get translated.
+experimental-features-web-api-link-preload-description = The <a data-l10n-name="rel">rel</a> attribute with value <code>"preload"</code> on a <a data-l10n-name="link">&lt;link&gt;</a> element is intended to help provide performance gains by letting you download resources earlier in the page lifecycle, ensuring that they’re available earlier and are less likely to block page rendering. Read <a data-l10n-name="readmore">“Preloading content with <code>rel="preload"</code>”</a> or see <a data-l10n-name="bugzilla">bug 1583604</a> for more details.
+
+# The title of the experiment should be kept in English as it may be referenced
+# by various online articles and is technical in nature.
+experimental-features-css-focus-visible =
+    .label = CSS: Pseudo-class: :focus-visible
+experimental-features-css-focus-visible-description = Allows focus styles to be applied to elements like buttons and form controls, only when they are focused using the keyboard (e.g. when tabbing between elements), and not when they are focused using a mouse or other pointing device. See <a data-l10n-name="bugzilla">bug 1617600</a> for more details.
+
+# The title of the experiment should be kept in English as it may be referenced
+# by various online articles and is technical in nature.
+experimental-features-web-api-beforeinput =
+    .label = Web API: beforeinput Event
+# The terms "beforeinput", "input", "textarea", and "contenteditable" are technical terms
+# and shouldn't be translated.
+experimental-features-web-api-beforeinput-description = The global <a data-l10n-name="mdn-beforeinput">beforeinput</a> event is fired on an <a data-l10n-name="mdn-input">&lt;input&gt;</a> and <a data-l10n-name="mdn-textarea">&lt;textarea&gt;</a> elements, or any element whose <a data-l10n-name="mdn-contenteditable">contenteditable</a> attribute is enabled, immediately before the element’s value changes. The event allows web apps to override the browser’s default behavior for user interaction, e.g., web apps can cancel user input only for specific characters or can modify pasting styled text only with approved styles.
+
+# The title of the experiment should be kept in English as it may be referenced
+# by various online articles and is technical in nature.
+experimental-features-css-constructable-stylesheets =
+    .label = CSS: Constructable Stylesheets
+experimental-features-css-constructable-stylesheets-description = The addition of a constructor to the <a data-l10n-name="mdn-cssstylesheet">CSSStyleSheet</a> interface as well as a variety of related changes makes it possible to directly create new stylesheets without having to add the sheet to the HTML. This makes it much easier to create reusable stylesheets for use with <a data-l10n-name="mdn-shadowdom">Shadow DOM</a>. See <a data-l10n-name="bugzilla">bug 1520690</a> for more details.
+
+experimental-features-devtools-color-scheme-simulation =
+    .label = Developer Tools: Color Scheme Simulation
+experimental-features-devtools-color-scheme-simulation-description = Adds an option to simulate different color schemes allowing you to test <a data-l10n-name="mdn-preferscolorscheme">@prefers-color-scheme</a> media queries. Using this media query lets your stylesheet respond to whether the user prefers a light or dark user interface. This feature lets you test your code without having to change settings in your browser (or operating system, if the browser follows a system-wide color scheme setting). See <a data-l10n-name="bugzilla1">bug 1550804</a> and <a data-l10n-name="bugzilla2">bug 1137699</a> for more details.
+
+experimental-features-devtools-execution-context-selector =
+    .label = Developer Tools: Execution Context Selector
+experimental-features-devtools-execution-context-selector-description = This feature displays a button on the console’s command line that lets you change the context in which the expression you enter will be executed. See <a data-l10n-name="bugzilla1">bug 1605154</a> and <a data-l10n-name="bugzilla2">bug 1605153</a> for more details.
+
+experimental-features-devtools-compatibility-panel =
+    .label = Developer Tools: Compatibility Panel
+experimental-features-devtools-compatibility-panel-description = A side panel for the Page Inspector that shows you information detailing your app’s cross-browser compatibility status. See <a data-l10n-name="bugzilla">bug 1584464</a> for more details.
+
+# Do not translate 'SameSite', 'Lax' and 'None'.
+experimental-features-cookie-samesite-lax-by-default2 =
+    .label = Cookies: SameSite=Lax by default
+experimental-features-cookie-samesite-lax-by-default2-description = Treat cookies as “SameSite=Lax” by default if no “SameSite” attribute is specified. Developers must opt-in to the current status quo of unrestricted use by explicitly asserting “SameSite=None”.
+
+# Do not translate 'SameSite', 'Lax' and 'None'.
+experimental-features-cookie-samesite-none-requires-secure2 =
+    .label = Cookies: SameSite=None requires secure attribute
+experimental-features-cookie-samesite-none-requires-secure2-description = Cookies with “SameSite=None” attribute require the secure attribute. This feature requires “Cookies: SameSite=Lax by default”.
+
+# about:home should be kept in English, as it refers to the the URI for
+# the internal default home page.
+experimental-features-abouthome-startup-cache =
+    .label = about:home startup cache
+experimental-features-abouthome-startup-cache-description = A cache for the initial about:home document that is loaded by default at startup. The purpose of the cache is to improve startup performance.
+
+experimental-features-print-preview-tab-modal =
+    .label = Print Preview Redesign
+experimental-features-print-preview-tab-modal-description = Introduces the redesigned print preview and makes print preview available on macOS. This potentially introduces breakage and does not include all print-related settings. To access all print-related settings, select “Print using the system dialog…” from within the Print panel.
+
+# The title of the experiment should be kept in English as it may be referenced
+# by various online articles and is technical in nature.
+experimental-features-cookie-samesite-schemeful =
+    .label = Cookies: Schemeful SameSite
+experimental-features-cookie-samesite-schemeful-description = Treat cookies from the same domain, but with different schemes (e.g. http://example.com and https://example.com) as cross-site instead of same-site. Improves security, but potentially introduces breakage.
+
+# "Service Worker" is an API name and is usually not translated.
+experimental-features-devtools-serviceworker-debugger-support =
+    .label = Developer Tools: Service Worker debugging
+# "Service Worker" is an API name and is usually not translated.
+experimental-features-devtools-serviceworker-debugger-support-description = Enables experimental support for Service Workers in the Debugger panel. This feature may slow the Developer Tools down and increase memory consumption.
+
+# WebRTC global mute toggle controls
+experimental-features-webrtc-global-mute-toggles =
+    .label = WebRTC Global Mute Toggles
+experimental-features-webrtc-global-mute-toggles-description = Add controls to the WebRTC global sharing indicator that allow users to globally mute their microphone and camera feeds.
+
+# JS JIT Warp project
+experimental-features-js-warp =
+    .label = JavaScript JIT: Warp
+experimental-features-js-warp-description = Enable Warp, a project to improve JavaScript performance and memory usage.
+
+# Fission is the name of the feature and should not be translated.
+experimental-features-fission =
+    .label = Fission (Site Isolation)
+experimental-features-fission-description = Fission (site isolation) is an experimental feature in { -brand-short-name } to provide an additional layer of defense against security bugs. By isolating each site into a separate process, Fission makes it harder for malicious websites to get access to information from other pages you are visiting. This is a major architectural change in { -brand-short-name } and we appreciate you testing and reporting any issues you might encounter. For more details, see <a data-l10n-name="wiki">the wiki</a>.
+
+# Support for having multiple Picture-in-Picture windows open simultaneously
+experimental-features-multi-pip =
+    .label = Multiple Picture-in-Picture Support
+experimental-features-multi-pip-description = Experimental support for allowing multiple Picture-in-Picture windows to be open at the same time.
+
+experimental-features-http3 =
+    .label = HTTP/3 protocol
+experimental-features-http3-description = Experimental support for the HTTP/3 protocol.
diff --git a/toolkit/locales/en-US/toolkit/global/createProfileWizard.ftl b/toolkit/locales/en-US/toolkit/global/createProfileWizard.ftl
new file mode 100644
index 0000000000..9df6b44b87
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/global/createProfileWizard.ftl
@@ -0,0 +1,53 @@
+# 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/.
+
+create-profile-window =
+  .title = Create Profile Wizard
+  .style = width: 45em; height: 32em;
+
+## First wizard page
+
+create-profile-first-page-header =
+  { PLATFORM() ->
+    [macos] Introduction
+   *[other] Welcome to the { create-profile-window.title }
+  }
+
+profile-creation-explanation-1 = { -brand-short-name } stores information about your settings and preferences in your personal profile.
+
+profile-creation-explanation-2 = If you are sharing this copy of { -brand-short-name } with other users, you can use profiles to keep each user’s information separate. To do this, each user should create his or her own profile.
+
+profile-creation-explanation-3 = If you are the only person using this copy of { -brand-short-name }, you must have at least one profile. If you would like, you can create multiple profiles for yourself to store different sets of settings and preferences. For example, you may want to have separate profiles for business and personal use.
+
+profile-creation-explanation-4 =
+  { PLATFORM() ->
+    [macos] To begin creating your profile, click Continue.
+   *[other] To begin creating your profile, click Next.
+  }
+
+## Second wizard page
+
+create-profile-last-page-header =
+  { PLATFORM() ->
+    [macos] Conclusion
+   *[other] Completing the { create-profile-window.title }
+  }
+
+profile-creation-intro = If you create several profiles you can tell them apart by the profile names. You may use the name provided here or use one of your own.
+
+profile-prompt = Enter new profile name:
+  .accesskey = E
+
+profile-default-name =
+  .value = Default User
+
+profile-directory-explanation = Your user settings, preferences and other user-related data will be stored in:
+
+create-profile-choose-folder =
+  .label = Choose Folder…
+  .accesskey = C
+
+create-profile-use-default =
+  .label = Use Default Folder
+  .accesskey = U
diff --git a/toolkit/locales/en-US/toolkit/global/handlerDialog.ftl b/toolkit/locales/en-US/toolkit/global/handlerDialog.ftl
new file mode 100644
index 0000000000..c2998fa53c
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/global/handlerDialog.ftl
@@ -0,0 +1,84 @@
+# 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/.
+
+## Permission Dialog
+## Variables:
+##  $host - the hostname that is initiating the request
+##  $scheme - the type of link that's being opened.
+##  $appName - Name of the application that will be opened.
+
+permission-dialog-description =
+  Allow this site to open the { $scheme } link?
+
+permission-dialog-description-file =
+  Allow this file to open the { $scheme } link?
+
+permission-dialog-description-host =
+  Allow { $host } to open the { $scheme } link?
+
+permission-dialog-description-app =
+  Allow this site to open the { $scheme } link with { $appName }?
+
+permission-dialog-description-host-app =
+  Allow { $host } to open the { $scheme } link with { $appName }?
+
+permission-dialog-description-file-app =
+  Allow this file to open the { $scheme } link with { $appName }?
+
+## Please keep the emphasis around the hostname and scheme (ie the
+## `<strong>` HTML tags). Please also keep the hostname as close to the start
+## of the sentence as your language's grammar allows.
+permission-dialog-remember =
+  Always allow <strong>{ $host }</strong> to open <strong>{ $scheme }</strong> links
+
+permission-dialog-remember-file =
+  Always allow this file to open <strong>{ $scheme }</strong> links
+
+##
+
+permission-dialog-btn-open-link =
+      .label = Open Link
+      .accessKey = O
+
+permission-dialog-btn-choose-app =
+      .label = Choose Application
+      .accessKey = A
+
+permission-dialog-unset-description = You’ll need to choose an application.
+
+permission-dialog-set-change-app-link = Choose a different application.
+
+
+## Chooser dialog
+## Variables:
+##  $scheme - the type of link that's being opened.
+
+chooser-window =
+      .title = Choose Application
+      .style = min-width: 26em; min-height: 26em;
+
+chooser-dialog =
+      .buttonlabelaccept = Open Link
+      .buttonaccesskeyaccept = O
+
+chooser-dialog-description = Choose an application to open the { $scheme } link.
+
+# Please keep the emphasis around the scheme (ie the `<strong>` HTML tags).
+chooser-dialog-remember =
+  Always use this application to open <strong>{ $scheme }</strong> links
+
+chooser-dialog-remember-extra = {
+  PLATFORM() ->
+      [windows] This can be changed in { -brand-short-name }’s options.
+     *[other] This can be changed in { -brand-short-name }’s preferences.
+  }
+
+choose-other-app-description = Choose other Application
+choose-app-btn =
+      .label = Choose…
+      .accessKey = C
+choose-other-app-window-title = Another Application…
+
+# Displayed under the name of a protocol handler in the Launch Application dialog.
+choose-dialog-privatebrowsing-disabled = Disabled in Private Windows
diff --git a/toolkit/locales/en-US/toolkit/global/processTypes.ftl b/toolkit/locales/en-US/toolkit/global/processTypes.ftl
new file mode 100644
index 0000000000..cd6208c7ae
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/global/processTypes.ftl
@@ -0,0 +1,36 @@
+# 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/.
+
+process-type-web = Web Content
+
+# process used to run privileged about pages,
+# such as about:home
+process-type-privilegedabout = Privileged About
+
+# process used to run privileged mozilla pages,
+# such as accounts.firefox.com
+process-type-privilegedmozilla = Privileged Mozilla Content
+
+process-type-extension = Extension
+
+# process used to open file:// URLs
+process-type-file = Local File
+
+# process used to isolate webpages that requested special
+# permission to allocate large amounts of memory
+process-type-weblargeallocation = Large Allocation
+
+# process used to isolate a webpage from other web pages
+# to improve security
+process-type-webisolated = Isolated Web Content
+
+# process used to communicate with the GPU for
+# graphics acceleration
+process-type-gpu = GPU
+
+# process used to perform network operations
+process-type-socket = Socket
+
+# process preallocated; may change to other types
+process-type-prealloc = Preallocated
diff --git a/toolkit/locales/en-US/toolkit/global/profileDowngrade.ftl b/toolkit/locales/en-US/toolkit/global/profileDowngrade.ftl
new file mode 100644
index 0000000000..55f1612227
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/global/profileDowngrade.ftl
@@ -0,0 +1,19 @@
+# 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/.
+
+profiledowngrade-window =
+    .title = You’ve launched an older version of { -brand-product-name }
+    .style = width: 490px;
+
+profiledowngrade-window-create =
+    .label = Create New Profile
+
+profiledowngrade-sync = Using an older version of { -brand-product-name } can corrupt bookmarks and browsing history already saved to an existing { -brand-product-name } profile. To protect your information, create a new profile for this installation of { -brand-short-name }. You can always sign in with a { -fxaccount-brand-name } to sync your bookmarks and browsing history between profiles.
+profiledowngrade-nosync = Using an older version of { -brand-product-name } can corrupt bookmarks and browsing history already saved to an existing { -brand-product-name } profile. To protect your information, create a new profile for this installation of { -brand-short-name }.
+
+profiledowngrade-quit =
+    .label = { PLATFORM() ->
+                 [windows] Exit
+                *[other] Quit
+             }
diff --git a/toolkit/locales/en-US/toolkit/global/profileSelection.ftl b/toolkit/locales/en-US/toolkit/global/profileSelection.ftl
new file mode 100644
index 0000000000..f5672732c2
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/global/profileSelection.ftl
@@ -0,0 +1,36 @@
+# 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/.
+
+profile-selection-window =
+  .title = { -brand-short-name } - Choose User Profile
+
+profile-selection-button-accept =
+  .label = Start { -brand-short-name }
+
+profile-selection-button-cancel =
+  .label = Exit
+
+profile-selection-new-button =
+  .label = Create Profile…
+  .accesskey = C
+
+profile-selection-rename-button =
+  .label = Rename Profile…
+  .accesskey = R
+
+profile-selection-delete-button =
+  .label = Delete Profile…
+  .accesskey = D
+
+## Messages used in the profile manager
+
+profile-manager-description = { -brand-short-name } stores information about your settings, preferences, and other user items in your user profile.
+
+profile-manager-work-offline =
+  .label = Work offline
+  .accesskey = o
+
+profile-manager-use-selected =
+  .label = Use the selected profile without asking at startup
+  .accesskey = s
diff --git a/toolkit/locales/en-US/toolkit/global/resetProfile.ftl b/toolkit/locales/en-US/toolkit/global/resetProfile.ftl
new file mode 100644
index 0000000000..869b6bab5f
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/global/resetProfile.ftl
@@ -0,0 +1,14 @@
+# 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/.
+
+refresh-profile-dialog =
+    .title = Refresh { -brand-short-name }
+refresh-profile-dialog-button =
+    .label = Refresh { -brand-short-name }
+refresh-profile-description = Start fresh to fix problems and restore performance.
+refresh-profile-description-details = This will:
+refresh-profile-remove = Remove your add-ons and customizations
+refresh-profile-restore = Restore your browser settings to their defaults
+refresh-profile = Give { -brand-short-name } a tune up
+refresh-profile-button = Refresh { -brand-short-name }…
diff --git a/toolkit/locales/en-US/toolkit/global/textActions.ftl b/toolkit/locales/en-US/toolkit/global/textActions.ftl
new file mode 100644
index 0000000000..c0a6637206
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/global/textActions.ftl
@@ -0,0 +1,49 @@
+# 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/.
+
+text-action-undo =
+    .label = Undo
+    .accesskey = U
+
+text-action-undo-shortcut =
+    .key = Z
+
+text-action-redo =
+    .label = Redo
+    .accesskey = R
+
+text-action-redo-shortcut =
+    .key = Y
+
+text-action-cut =
+    .label = Cut
+    .accesskey = t
+
+text-action-cut-shortcut =
+    .key = X
+
+text-action-copy =
+    .label = Copy
+    .accesskey = C
+
+text-action-copy-shortcut =
+    .key = C
+
+text-action-paste =
+    .label = Paste
+    .accesskey = P
+
+text-action-paste-shortcut =
+    .key = V
+
+text-action-delete =
+    .label = Delete
+    .accesskey = D
+
+text-action-select-all =
+    .label = Select All
+    .accesskey = A
+
+text-action-select-all-shortcut =
+    .key = A
diff --git a/toolkit/locales/en-US/toolkit/global/unknownContentType.ftl b/toolkit/locales/en-US/toolkit/global/unknownContentType.ftl
new file mode 100644
index 0000000000..c46bcffda7
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/global/unknownContentType.ftl
@@ -0,0 +1,14 @@
+# 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/.
+
+unknowncontenttype-handleinternally =
+    .label = Open with { -brand-short-name }
+    .accesskey = e
+
+unknowncontenttype-settingschange =
+    .value =
+        { PLATFORM() ->
+            [windows] Settings can be changed in { -brand-short-name }’s Options.
+           *[other] Settings can be changed in { -brand-short-name }’s Preferences.
+        }
diff --git a/toolkit/locales/en-US/toolkit/global/videocontrols.ftl b/toolkit/locales/en-US/toolkit/global/videocontrols.ftl
new file mode 100644
index 0000000000..a90d3b7516
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/global/videocontrols.ftl
@@ -0,0 +1,14 @@
+# 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/.
+
+videocontrols-scrubber =
+    .aria-label = Position
+# This label is used by screenreaders and other assistive technology to indicate
+# to users how much of the video has been loaded from the network. It will be
+# followed by the percentage of the video that has loaded (e.g. "Loading: 13%").
+videocontrols-buffer-bar-label = Loading:
+videocontrols-volume-control =
+    .aria-label = Volume
+videocontrols-closed-caption-button =
+    .aria-label = Closed Captions
diff --git a/toolkit/locales/en-US/toolkit/global/wizard.ftl b/toolkit/locales/en-US/toolkit/global/wizard.ftl
new file mode 100644
index 0000000000..b8ef359fa7
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/global/wizard.ftl
@@ -0,0 +1,37 @@
+# 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/.
+
+wizard-macos-button-back =
+  .label = Go Back
+  .accesskey = B
+wizard-linux-button-back =
+  .label = Back
+  .accesskey = B
+wizard-win-button-back =
+  .label = < Back
+  .accesskey = B
+
+wizard-macos-button-next =
+  .label = Continue
+  .accesskey = C
+wizard-linux-button-next =
+  .label = Next
+  .accesskey = N
+wizard-win-button-next =
+  .label = Next >
+  .accesskey = N
+
+wizard-macos-button-finish =
+  .label = Done
+wizard-linux-button-finish =
+  .label = Finish
+wizard-win-button-finish =
+  .label = Finish
+
+wizard-macos-button-cancel =
+  .label = Cancel
+wizard-linux-button-cancel =
+  .label = Cancel
+wizard-win-button-cancel =
+  .label = Cancel
diff --git a/toolkit/locales/en-US/toolkit/intl/languageNames.ftl b/toolkit/locales/en-US/toolkit/intl/languageNames.ftl
new file mode 100644
index 0000000000..1f9e6fafcb
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/intl/languageNames.ftl
@@ -0,0 +1,212 @@
+# 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/.
+
+language-name-aa = Afar
+language-name-ab = Abkhazian
+language-name-ach = Acholi
+language-name-ae = Avestan
+language-name-af = Afrikaans
+language-name-ak = Akan
+language-name-am = Amharic
+language-name-an = Aragonese
+language-name-ar = Arabic
+language-name-as = Assamese
+language-name-ast = Asturian
+language-name-av = Avaric
+language-name-ay = Aymara
+language-name-az = Azerbaijani
+language-name-ba = Bashkir
+language-name-be = Belarusian
+language-name-bg = Bulgarian
+language-name-bh = Bihari
+language-name-bi = Bislama
+language-name-bm = Bambara
+language-name-bn = Bengali
+language-name-bo = Tibetan
+language-name-br = Breton
+language-name-bs = Bosnian
+language-name-ca = Catalan
+language-name-cak = Kaqchikel
+language-name-ce = Chechen
+language-name-ch = Chamorro
+language-name-co = Corsican
+language-name-cr = Cree
+language-name-crh = Crimean Tatar
+language-name-cs = Czech
+language-name-csb = Kashubian
+language-name-cu = Church Slavic
+language-name-cv = Chuvash
+language-name-cy = Welsh
+language-name-da = Danish
+language-name-de = German
+language-name-dsb = Lower Sorbian
+language-name-dv = Divehi
+language-name-dz = Dzongkha
+language-name-ee = Ewe
+language-name-el = Greek
+language-name-en = English
+language-name-eo = Esperanto
+language-name-es = Spanish
+language-name-et = Estonian
+language-name-eu = Basque
+language-name-fa = Persian
+language-name-ff = Fulah
+language-name-fi = Finnish
+language-name-fj = Fijian
+language-name-fo = Faroese
+language-name-fr = French
+language-name-fur = Friulian
+language-name-fy = Frisian
+language-name-ga = Irish
+language-name-gd = Scottish Gaelic
+language-name-gl = Galician
+language-name-gn = Guarani
+language-name-gu = Gujarati
+language-name-gv = Manx
+language-name-ha = Hausa
+language-name-haw = Hawaiian
+language-name-he = Hebrew
+language-name-hi = Hindi
+language-name-hil = Hiligaynon
+language-name-ho = Hiri Motu
+language-name-hr = Croatian
+language-name-hsb = Upper Sorbian
+language-name-ht = Haitian
+language-name-hu = Hungarian
+language-name-hy = Armenian
+language-name-hz = Herero
+language-name-ia = Interlingua
+language-name-id = Indonesian
+language-name-ie = Interlingue
+language-name-ig = Igbo
+language-name-ii = Sichuan Yi
+language-name-ik = Inupiaq
+language-name-io = Ido
+language-name-is = Icelandic
+language-name-it = Italian
+language-name-iu = Inuktitut
+language-name-ja = Japanese
+language-name-jv = Javanese
+language-name-ka = Georgian
+language-name-kab = Kabyle
+language-name-kg = Kongo
+language-name-ki = Kikuyu
+language-name-kj = Kuanyama
+language-name-kk = Kazakh
+language-name-kl = Greenlandic
+language-name-km = Khmer
+language-name-kn = Kannada
+language-name-ko = Korean
+language-name-kok = Konkani
+language-name-kr = Kanuri
+language-name-ks = Kashmiri
+language-name-ku = Kurdish
+language-name-kv = Komi
+language-name-kw = Cornish
+language-name-ky = Kirghiz
+language-name-la = Latin
+language-name-lb = Luxembourgish
+language-name-lg = Ganda
+language-name-li = Limburgan
+language-name-lij = Ligurian
+language-name-ln = Lingala
+language-name-lo = Lao
+language-name-lt = Lithuanian
+language-name-ltg = Latgalian
+language-name-lu = Luba-Katanga
+language-name-lv = Latvian
+language-name-mai = Maithili
+language-name-meh = Southwestern Tlaxiaco Mixtec
+language-name-mg = Malagasy
+language-name-mh = Marshallese
+language-name-mi = Maori
+language-name-mix = Mixtepec Mixtec
+language-name-mk = Macedonian
+language-name-ml = Malayalam
+language-name-mn = Mongolian
+language-name-mr = Marathi
+language-name-ms = Malay
+language-name-mt = Maltese
+language-name-my = Burmese
+language-name-na = Nauru
+language-name-nb = Norwegian Bokmål
+language-name-nd = Ndebele, North
+language-name-ne = Nepali
+language-name-ng = Ndonga
+language-name-nl = Dutch
+language-name-nn = Norwegian Nynorsk
+language-name-no = Norwegian
+language-name-nr = Ndebele, South
+language-name-nso = Sotho, Northern
+language-name-nv = Navajo
+language-name-ny = Chichewa
+language-name-oc = Occitan
+language-name-oj = Ojibwa
+language-name-om = Oromo
+language-name-or = Odia
+language-name-os = Ossetian
+language-name-pa = Punjabi
+language-name-pi = Pali
+language-name-pl = Polish
+language-name-ps = Pashto
+language-name-pt = Portuguese
+language-name-qu = Quechua
+language-name-rm = Rhaeto-Romanic
+language-name-rn = Kirundi
+language-name-ro = Romanian
+language-name-ru = Russian
+language-name-rw = Kinyarwanda
+language-name-sa = Sanskrit
+language-name-sc = Sardinian
+language-name-sd = Sindhi
+language-name-se = Northern Sami
+language-name-sg = Sango
+language-name-si = Singhalese
+language-name-sk = Slovak
+language-name-sl = Slovenian
+language-name-sm = Samoan
+language-name-sn = Shona
+language-name-so = Somali
+language-name-son = Songhay
+language-name-sq = Albanian
+language-name-sr = Serbian
+language-name-ss = Siswati
+language-name-st = Sotho, Southern
+language-name-su = Sundanese
+language-name-sv = Swedish
+language-name-sw = Swahili
+language-name-ta = Tamil
+language-name-te = Telugu
+language-name-tg = Tajik
+language-name-th = Thai
+language-name-ti = Tigrinya
+language-name-tig = Tigre
+language-name-tk = Turkmen
+language-name-tl = Tagalog
+language-name-tlh = Klingon
+language-name-tn = Tswana
+language-name-to = Tonga
+language-name-tr = Turkish
+language-name-trs = Triqui
+language-name-ts = Tsonga
+language-name-tt = Tatar
+language-name-tw = Twi
+language-name-ty = Tahitian
+language-name-ug = Uighur
+language-name-uk = Ukrainian
+language-name-ur = Urdu
+language-name-uz = Uzbek
+language-name-ve = Venda
+language-name-vi = Vietnamese
+language-name-vo = Volapük
+language-name-wa = Walloon
+language-name-wen = Sorbian
+language-name-wo = Wolof
+language-name-xh = Xhosa
+language-name-yi = Yiddish
+language-name-yo = Yoruba
+language-name-za = Zhuang
+language-name-zam = Miahuatlán Zapotec
+language-name-zh = Chinese
+language-name-zu = Zulu
diff --git a/toolkit/locales/en-US/toolkit/intl/regionNames.ftl b/toolkit/locales/en-US/toolkit/intl/regionNames.ftl
new file mode 100644
index 0000000000..443bfd5561
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/intl/regionNames.ftl
@@ -0,0 +1,279 @@
+# 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/.
+
+### Notice: If you're updating this list, you should also
+###         update the list in mozIntl.js.
+
+region-name-ad = Andorra
+region-name-ae = United Arab Emirates
+region-name-af = Afghanistan
+region-name-ag = Antigua and Barbuda
+region-name-ai = Anguilla
+region-name-al = Albania
+region-name-am = Armenia
+region-name-ao = Angola
+region-name-aq = Antarctica
+region-name-ar = Argentina
+region-name-as = American Samoa
+region-name-at = Austria
+region-name-au = Australia
+region-name-aw = Aruba
+region-name-az = Azerbaijan
+region-name-ba = Bosnia and Herzegovina
+region-name-bb = Barbados
+region-name-bd = Bangladesh
+region-name-be = Belgium
+region-name-bf = Burkina Faso
+region-name-bg = Bulgaria
+region-name-bh = Bahrain
+region-name-bi = Burundi
+region-name-bj = Benin
+region-name-bl = Saint Barthelemy
+region-name-bm = Bermuda
+region-name-bn = Brunei
+region-name-bo = Bolivia
+region-name-bq = Bonaire, Sint Eustatius, and Saba
+region-name-br = Brazil
+region-name-bs = Bahamas, The
+region-name-bt = Bhutan
+region-name-bv = Bouvet Island
+region-name-bw = Botswana
+region-name-by = Belarus
+region-name-bz = Belize
+region-name-ca = Canada
+region-name-cc = Cocos (Keeling) Islands
+region-name-cd = Congo (Kinshasa)
+region-name-cf = Central African Republic
+region-name-cg = Congo (Brazzaville)
+region-name-ch = Switzerland
+region-name-ci = Côte d’Ivoire
+region-name-ck = Cook Islands
+region-name-cl = Chile
+region-name-cm = Cameroon
+region-name-cn = China
+region-name-co = Colombia
+region-name-cp = Clipperton Island
+region-name-cr = Costa Rica
+region-name-cu = Cuba
+region-name-cv = Cabo Verde
+region-name-cw = Curaçao
+region-name-cx = Christmas Island
+region-name-cy = Cyprus
+region-name-cz = Czech Republic
+region-name-de = Germany
+region-name-dg = Diego Garcia
+region-name-dj = Djibouti
+region-name-dk = Denmark
+region-name-dm = Dominica
+region-name-do = Dominican Republic
+region-name-dz = Algeria
+region-name-ec = Ecuador
+region-name-ee = Estonia
+region-name-eg = Egypt
+region-name-eh = Western Sahara
+region-name-er = Eritrea
+region-name-es = Spain
+region-name-et = Ethiopia
+region-name-fi = Finland
+region-name-fj = Fiji
+region-name-fk = Falkland Islands (Islas Malvinas)
+region-name-fm = Micronesia, Federated States of
+region-name-fo = Faroe Islands
+region-name-fr = France
+region-name-ga = Gabon
+region-name-gb = United Kingdom
+region-name-gd = Grenada
+region-name-ge = Georgia
+region-name-gf = French Guiana
+region-name-gg = Guernsey
+region-name-gh = Ghana
+region-name-gi = Gibraltar
+region-name-gl = Greenland
+region-name-gm = Gambia, The
+region-name-gn = Guinea
+region-name-gp = Guadeloupe
+region-name-gq = Equatorial Guinea
+region-name-gr = Greece
+region-name-gs = South Georgia and South Sandwich Islands
+region-name-gt = Guatemala
+region-name-gu = Guam
+region-name-gw = Guinea-Bissau
+region-name-gy = Guyana
+region-name-hk = Hong Kong
+region-name-hm = Heard Island and McDonald Islands
+region-name-hn = Honduras
+region-name-hr = Croatia
+region-name-ht = Haiti
+region-name-hu = Hungary
+region-name-id = Indonesia
+region-name-ie = Ireland
+region-name-il = Israel
+region-name-im = Isle of Man
+region-name-in = India
+region-name-io = British Indian Ocean Territory
+region-name-iq = Iraq
+region-name-ir = Iran
+region-name-is = Iceland
+region-name-it = Italy
+region-name-je = Jersey
+region-name-jm = Jamaica
+region-name-jo = Jordan
+region-name-jp = Japan
+region-name-ke = Kenya
+region-name-kg = Kyrgyzstan
+region-name-kh = Cambodia
+region-name-ki = Kiribati
+region-name-km = Comoros
+region-name-kn = Saint Kitts and Nevis
+region-name-kp = Korea, North
+region-name-kr = Korea, South
+region-name-kw = Kuwait
+region-name-ky = Cayman Islands
+region-name-kz = Kazakhstan
+region-name-la = Laos
+region-name-lb = Lebanon
+region-name-lc = Saint Lucia
+region-name-li = Liechtenstein
+region-name-lk = Sri Lanka
+region-name-lr = Liberia
+region-name-ls = Lesotho
+region-name-lt = Lithuania
+region-name-lu = Luxembourg
+region-name-lv = Latvia
+region-name-ly = Libya
+region-name-ma = Morocco
+region-name-mc = Monaco
+region-name-md = Moldova
+region-name-me = Montenegro
+region-name-mf = Saint Martin
+region-name-mg = Madagascar
+region-name-mh = Marshall Islands
+region-name-mk = Macedonia
+region-name-ml = Mali
+region-name-mm = Burma
+region-name-mn = Mongolia
+region-name-mo = Macau
+region-name-mp = Northern Mariana Islands
+region-name-mq = Martinique
+region-name-mr = Mauritania
+region-name-ms = Montserrat
+region-name-mt = Malta
+region-name-mu = Mauritius
+region-name-mv = Maldives
+region-name-mw = Malawi
+region-name-mx = Mexico
+region-name-my = Malaysia
+region-name-mz = Mozambique
+region-name-na = Namibia
+region-name-nc = New Caledonia
+region-name-ne = Niger
+region-name-nf = Norfolk Island
+region-name-ng = Nigeria
+region-name-ni = Nicaragua
+region-name-nl = Netherlands
+region-name-no = Norway
+region-name-np = Nepal
+region-name-nr = Nauru
+region-name-nu = Niue
+region-name-nz = New Zealand
+region-name-om = Oman
+region-name-pa = Panama
+region-name-pe = Peru
+region-name-pf = French Polynesia
+region-name-pg = Papua New Guinea
+region-name-ph = Philippines
+region-name-pk = Pakistan
+region-name-pl = Poland
+region-name-pm = Saint Pierre and Miquelon
+region-name-pn = Pitcairn Islands
+region-name-pr = Puerto Rico
+region-name-pt = Portugal
+region-name-pw = Palau
+region-name-py = Paraguay
+region-name-qa = Qatar
+region-name-qm = Midway Islands
+region-name-qs = Bassas da India
+region-name-qu = Juan de Nova Island
+region-name-qw = Wake Island
+region-name-qx = Glorioso Islands
+region-name-qz = Akrotiri
+region-name-re = Reunion
+region-name-ro = Romania
+region-name-rs = Serbia
+region-name-ru = Russia
+region-name-rw = Rwanda
+region-name-sa = Saudi Arabia
+region-name-sb = Solomon Islands
+region-name-sc = Seychelles
+region-name-sd = Sudan
+region-name-se = Sweden
+region-name-sg = Singapore
+region-name-sh = Saint Helena, Ascension, and Tristan da Cunha
+region-name-si = Slovenia
+region-name-sk = Slovakia
+region-name-sl = Sierra Leone
+region-name-sm = San Marino
+region-name-sn = Senegal
+region-name-so = Somalia
+region-name-sr = Suriname
+region-name-ss = South Sudan
+region-name-st = Sao Tome and Principe
+region-name-sv = El Salvador
+region-name-sx = Sint Maarten
+region-name-sy = Syria
+region-name-sz = Swaziland
+region-name-tc = Turks and Caicos Islands
+region-name-td = Chad
+region-name-tf = French Southern and Antarctic Lands
+region-name-tg = Togo
+region-name-th = Thailand
+region-name-tj = Tajikistan
+region-name-tk = Tokelau
+region-name-tl = Timor-Leste
+region-name-tm = Turkmenistan
+region-name-tn = Tunisia
+region-name-to = Tonga
+region-name-tr = Turkey
+region-name-tt = Trinidad and Tobago
+region-name-tv = Tuvalu
+region-name-tw = Taiwan
+region-name-tz = Tanzania
+region-name-ua = Ukraine
+region-name-ug = Uganda
+region-name-us = United States
+region-name-uy = Uruguay
+region-name-uz = Uzbekistan
+region-name-va = Vatican City
+region-name-vc = Saint Vincent and the Grenadines
+region-name-ve = Venezuela
+region-name-vg = Virgin Islands, British
+region-name-vi = Virgin Islands, U.S.
+region-name-vn = Vietnam
+region-name-vu = Vanuatu
+region-name-wf = Wallis and Futuna
+region-name-ws = Samoa
+region-name-xa = Ashmore and Cartier Islands
+region-name-xb = Baker Island
+region-name-xc = Coral Sea Islands
+region-name-xd = Dhekelia
+region-name-xe = Europa Island
+region-name-xg = Gaza Strip
+region-name-xh = Howland Island
+region-name-xj = Jan Mayen
+region-name-xk = Kosovo
+region-name-xl = Palmyra Atoll
+region-name-xm = Kingman Reef
+region-name-xp = Paracel Islands
+region-name-xq = Jarvis Island
+region-name-xr = Svalbard
+region-name-xs = Spratly Islands
+region-name-xt = Tromelin Island
+region-name-xu = Johnston Atoll
+region-name-xv = Navassa Island
+region-name-xw = West Bank
+region-name-ye = Yemen
+region-name-yt = Mayotte
+region-name-za = South Africa
+region-name-zm = Zambia
+region-name-zw = Zimbabwe
diff --git a/toolkit/locales/en-US/toolkit/main-window/autocomplete.ftl b/toolkit/locales/en-US/toolkit/main-window/autocomplete.ftl
new file mode 100644
index 0000000000..d56b1761b2
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/main-window/autocomplete.ftl
@@ -0,0 +1,22 @@
+# 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/.
+
+## Import Logins Autocomplete
+
+## Variables:
+##   $host (String) - Host name of the current site.
+
+autocomplete-import-logins-chrome =
+    <div data-l10n-name="line1">Import your login from Google Chrome</div>
+    <div data-l10n-name="line2">for { $host } and other sites</div>
+autocomplete-import-logins-chromium =
+    <div data-l10n-name="line1">Import your login from Chromium</div>
+    <div data-l10n-name="line2">for { $host } and other sites</div>
+autocomplete-import-logins-chromium-edge =
+    <div data-l10n-name="line1">Import your login from Microsoft Edge</div>
+    <div data-l10n-name="line2">for { $host } and other sites</div>
+
+##
+
+autocomplete-import-learn-more = Learn more
diff --git a/toolkit/locales/en-US/toolkit/main-window/findbar.ftl b/toolkit/locales/en-US/toolkit/main-window/findbar.ftl
new file mode 100644
index 0000000000..61fe0bbd00
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/main-window/findbar.ftl
@@ -0,0 +1,36 @@
+# 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/.
+
+### This file contains the entities needed to use the Find Bar.
+
+findbar-next =
+    .tooltiptext = Find the next occurrence of the phrase
+findbar-previous =
+    .tooltiptext = Find the previous occurrence of the phrase
+
+findbar-find-button-close =
+    .tooltiptext = Close find bar
+
+findbar-highlight-all2 =
+    .label = Highlight All
+    .accesskey = { PLATFORM() ->
+        [macos] l
+       *[other] a
+    }
+    .tooltiptext = Highlight all occurrences of the phrase
+
+findbar-case-sensitive =
+    .label = Match Case
+    .accesskey = C
+    .tooltiptext = Search with case sensitivity
+
+findbar-match-diacritics =
+    .label = Match Diacritics
+    .accesskey = i
+    .tooltiptext = Distinguish between accented letters and their base letters (for example, when searching for “resume”, “résumé” will not be matched)
+
+findbar-entire-word =
+    .label = Whole Words
+    .accesskey = W
+    .tooltiptext = Search whole words only
diff --git a/toolkit/locales/en-US/toolkit/payments/payments.ftl b/toolkit/locales/en-US/toolkit/payments/payments.ftl
new file mode 100644
index 0000000000..c806997f40
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/payments/payments.ftl
@@ -0,0 +1,52 @@
+# 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/.
+
+
+# This value isn't used directly, but is defined to avoid duplication
+# in the "credit-card-label-*" strings.
+#
+# Variables:
+#   $month (String): Numeric month the credit card expires
+#   $year (String): Four-digit year the credit card expires
+credit-card-expiration = Expires on { $month }/{ $year }
+
+## These labels serve as a description of a credit card.
+## The description must include a credit card number, and may optionally
+## include a cardholder name, an expiration date, or both, so we have
+## four variations.
+
+# Label for a credit card with a number only
+#
+# Variables:
+#   $number (String): Partially-redacted credit card number
+#   $type (String): Credit card type
+credit-card-label-number-2 = { $number }
+    .aria-label = { $type } { credit-card-label-number-2 }
+
+# Label for a credit card with a number and name
+#
+# Variables:
+#   $number (String): Partially-redacted credit card number
+#   $name (String): Cardholder name
+#   $type (String): Credit card type
+credit-card-label-number-name-2 = { $number }, { $name }
+    .aria-label = { $type } { credit-card-label-number-name-2 }
+
+# Label for a credit card with a number and expiration date
+#
+# Variables:
+#   $number (String): Partially-redacted credit card number
+#   $type (String): Credit card type
+credit-card-label-number-expiration-2 = { $number }, { credit-card-expiration }
+    .aria-label = { $type } { credit-card-label-number-expiration-2 }
+
+# Label for a credit card with a number, name, and expiration date
+#
+# Variables:
+#   $number (String): Partially-redacted credit card number
+#   $name (String): Cardholder name
+#   $type (String): Credit card type
+credit-card-label-number-name-expiration-2 =
+  { $number }, { $name }, { credit-card-expiration }
+    .aria-label = { $type } { credit-card-label-number-name-expiration-2 }
diff --git a/toolkit/locales/en-US/toolkit/pictureinpicture/pictureinpicture.ftl b/toolkit/locales/en-US/toolkit/pictureinpicture/pictureinpicture.ftl
new file mode 100644
index 0000000000..b122ecdae7
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/pictureinpicture/pictureinpicture.ftl
@@ -0,0 +1,21 @@
+# 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/.
+
+pictureinpicture-player-title = Picture-in-Picture
+
+pictureinpicture-pause =
+  .aria-label = Pause
+pictureinpicture-play =
+  .aria-label = Play
+
+pictureinpicture-mute =
+  .aria-label = Mute
+pictureinpicture-unmute =
+  .aria-label = Unmute
+
+pictureinpicture-unpip =
+  .aria-label = Send back to tab
+
+pictureinpicture-close =
+  .aria-label = Close
diff --git a/toolkit/locales/en-US/toolkit/preferences/preferences.ftl b/toolkit/locales/en-US/toolkit/preferences/preferences.ftl
new file mode 100644
index 0000000000..7c4f99e0e2
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/preferences/preferences.ftl
@@ -0,0 +1,40 @@
+# 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/.
+
+password-not-set =
+    .value = (not set)
+
+failed-pp-change = Unable to change Primary Password.
+incorrect-pp = You did not enter the correct current Primary Password. Please try again.
+pp-change-ok = Primary Password successfully changed.
+
+pp-empty-warning = Your stored passwords and private keys will not be protected.
+pp-erased-ok = You have deleted your Primary Password. { pp-empty-warning }
+pp-not-wanted = Warning! You have decided not to use a Primary Password. { pp-empty-warning }
+
+pp-change2empty-in-fips-mode = You are currently in FIPS mode. FIPS requires a non-empty Primary Password.
+pw-change-success-title = Password Change Succeeded
+pw-change-failed-title = Password Change Failed
+pw-remove-button =
+    .label = Remove
+
+primary-password-dialog =
+    .title = Primary Password
+set-password-old-password = Current password:
+set-password-new-password = Enter new password:
+set-password-reenter-password = Re-enter password:
+set-password-meter = Password quality meter
+set-password-meter-loading = Loading
+primary-password-admin = Your administrator requires that you have a Primary Password set in order to save logins and passwords.
+primary-password-description = A Primary Password is used to protect some sensitive information, like logins and passwords, on this device. If you create a Primary Password you will be asked to enter it once per session when { -brand-short-name } retrieves saved information protected by the password.
+primary-password-warning = Please make sure you remember the Primary Password you have set. If you forget your Primary Password, you will be unable to access any of the information protected by it on this device.
+
+remove-primary-password =
+    .title = Remove Primary Password
+remove-info =
+    .value = You must enter your current password to proceed:
+remove-primary-password-warning1 = Your Primary Password is used to protect sensitive information like logins and passwords.
+remove-primary-password-warning2 = If you remove your Primary Password your information will not be protected if your computer is compromised.
+remove-password-old-password =
+    .value = Current password:
diff --git a/toolkit/locales/en-US/toolkit/printing/printDialogs.ftl b/toolkit/locales/en-US/toolkit/printing/printDialogs.ftl
new file mode 100644
index 0000000000..6af0b01799
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/printing/printDialogs.ftl
@@ -0,0 +1,112 @@
+# 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/.
+
+print-setup =
+    .title = Page Setup
+custom-prompt-title = Custom…
+custom-prompt-prompt = Enter your custom header/footer text
+basic-tab =
+    .label = Format & Options
+advanced-tab =
+    .label = Margins & Header/Footer
+format-group-label =
+    .value = Format
+orientation-label =
+    .value = Orientation:
+portrait =
+    .label = Portrait
+    .accesskey = P
+landscape =
+    .label = Landscape
+    .accesskey = L
+scale =
+    .label = Scale:
+    .accesskey = S
+scale-percent =
+    .value = %
+shrink-to-fit =
+    .label = Shrink to fit Page Width
+    .accesskey = W
+options-group-label =
+    .value = Options
+print-bg =
+    .label = Print Background (colors & images)
+    .accesskey = B
+margin-group-label-inches =
+    .value = Margins (inches)
+margin-group-label-metric =
+    .value = Margins (millimeters)
+margin-top =
+    .value = Top:
+    .accesskey = T
+margin-top-invisible =
+    .value = Top:
+margin-bottom =
+    .value = Bottom:
+    .accesskey = B
+margin-bottom-invisible =
+    .value = Bottom:
+margin-left =
+    .value = Left:
+    .accesskey = L
+margin-left-invisible =
+    .value = Left:
+margin-right =
+    .value = Right:
+    .accesskey = R
+margin-right-invisible =
+    .value = Right:
+header-footer-label =
+    .value = Headers & Footers
+hf-left-label =
+    .value = Left:
+hf-center-label =
+    .value = Center:
+hf-right-label =
+    .value = Right:
+header-left-tip =
+    .tooltiptext = Left header
+header-center-tip =
+    .tooltiptext = Center header
+header-right-tip =
+    .tooltiptext = Right header
+footer-left-tip =
+    .tooltiptext = Left footer
+footer-center-tip =
+    .tooltiptext = Center footer
+footer-right-tip =
+    .tooltiptext = Right footer
+hf-blank =
+    .label = --blank--
+hf-title =
+    .label = Title
+hf-url =
+    .label = URL
+hf-date-and-time =
+    .label = Date/Time
+hf-page =
+    .label = Page #
+hf-page-and-total =
+    .label = Page # of #
+hf-custom =
+    .label = Custom…
+print-preview-window =
+    .title = Print Preview
+print-title =
+    .value = Title:
+print-preparing =
+    .value = Preparing…
+print-progress =
+    .value = Progress:
+print-window =
+    .title = Printing
+print-complete =
+    .value = Printing is Completed.
+
+# Variables
+# $percent (integer) - Number of printed percentage
+print-percent =
+    .value = { $percent }%
+dialog-cancel-label = Cancel
+dialog-close-label = Close
diff --git a/toolkit/locales/en-US/toolkit/printing/printPreview.ftl b/toolkit/locales/en-US/toolkit/printing/printPreview.ftl
new file mode 100644
index 0000000000..e0a275de5e
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/printing/printPreview.ftl
@@ -0,0 +1,72 @@
+# 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/.
+
+printpreview-simplify-page-checkbox =
+    .label = Simplify Page
+    .accesskey = i
+    .tooltiptext = This page cannot be automatically simplified
+printpreview-simplify-page-checkbox-enabled =
+    .label = { printpreview-simplify-page-checkbox.label }
+    .accesskey = { printpreview-simplify-page-checkbox.accesskey }
+    .tooltiptext = Change layout for easier reading
+printpreview-close =
+    .label = Close
+    .accesskey = C
+printpreview-portrait =
+    .label = Portrait
+    .accesskey = o
+printpreview-landscape =
+    .label = Landscape
+    .accesskey = L
+printpreview-scale =
+    .value = Scale:
+    .accesskey = S
+printpreview-shrink-to-fit =
+    .label = Shrink To Fit
+printpreview-custom =
+    .label = Custom…
+printpreview-print =
+    .label = Print…
+    .accesskey = P
+printpreview-of =
+    .value = of
+printpreview-custom-scale-prompt-title = Custom Scale
+printpreview-page-setup =
+    .label = Page Setup…
+    .accesskey = u
+printpreview-page =
+    .value = Page:
+    .accesskey = a
+
+# Variables
+# $sheetNum (integer) - The current sheet number
+# $sheetCount (integer) - The total number of sheets to print
+printpreview-sheet-of-sheets = { $sheetNum } of { $sheetCount }
+
+## Variables
+## $percent (integer) - menuitem percent label
+## $arrow (String) - UTF-8 arrow character for navigation buttons
+
+printpreview-percentage-value =
+    .label = { $percent }%
+printpreview-homearrow =
+    .label = { $arrow }
+    .tooltiptext = First page
+printpreview-previousarrow =
+    .label = { $arrow }
+    .tooltiptext = Previous page
+printpreview-nextarrow =
+    .label = { $arrow }
+    .tooltiptext = Next page
+printpreview-endarrow =
+    .label = { $arrow }
+    .tooltiptext = Last page
+printpreview-homearrow-button =
+    .title = First page
+printpreview-previousarrow-button =
+    .title = Previous page
+printpreview-nextarrow-button =
+    .title = Next page
+printpreview-endarrow-button =
+    .title = Last page
diff --git a/toolkit/locales/en-US/toolkit/printing/printUI.ftl b/toolkit/locales/en-US/toolkit/printing/printUI.ftl
new file mode 100644
index 0000000000..b555f21b93
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/printing/printUI.ftl
@@ -0,0 +1,121 @@
+# 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/.
+
+printui-title = Print
+# Dialog title to prompt the user for a filename to save print to PDF.
+printui-save-to-pdf-title = Save As
+
+# Variables
+# $sheetCount (integer) - Number of paper sheets
+printui-sheets-count =
+    { $sheetCount ->
+        [one] { $sheetCount } sheet of paper
+       *[other] { $sheetCount } sheets of paper
+    }
+
+printui-page-range-all = All
+printui-page-range-custom = Custom
+printui-page-range-label = Pages
+printui-page-range-picker =
+  .aria-label = Pick page range
+printui-page-custom-range-input =
+  .aria-label = Enter custom page range
+  .placeholder = e.g. 2-6, 9, 12-16
+
+# Section title for the number of copies to print
+printui-copies-label = Copies
+
+printui-orientation = Orientation
+printui-landscape = Landscape
+printui-portrait = Portrait
+
+# Section title for the printer or destination device to target
+printui-destination-label = Destination
+printui-destination-pdf-label = Save to PDF
+
+printui-more-settings = More settings
+printui-less-settings = Fewer settings
+
+printui-paper-size-label = Paper size
+
+# Section title (noun) for the print scaling options
+printui-scale = Scale
+printui-scale-fit-to-page-width = Fit to page width
+# Label for input control where user can set the scale percentage
+printui-scale-pcent = Scale
+
+# Section title (noun) for the two-sided print options
+printui-two-sided-printing = Two-sided printing
+printui-duplex-checkbox = Print on both sides
+
+# Section title for miscellaneous print options
+printui-options = Options
+printui-headers-footers-checkbox = Print headers and footers
+printui-backgrounds-checkbox = Print backgrounds
+printui-selection-checkbox = Print selection only
+
+printui-color-mode-label = Color mode
+printui-color-mode-color = Color
+printui-color-mode-bw = Black and white
+
+printui-margins = Margins
+printui-margins-default = Default
+printui-margins-min = Minimum
+printui-margins-none = None
+printui-margins-custom-inches = Custom (inches)
+printui-margins-custom-top = Top
+printui-margins-custom-top-inches = Top (inches)
+printui-margins-custom-bottom = Bottom
+printui-margins-custom-bottom-inches = Bottom (inches)
+printui-margins-custom-left = Left
+printui-margins-custom-left-inches = Left (inches)
+printui-margins-custom-right = Right
+printui-margins-custom-right-inches = Right (inches)
+
+printui-system-dialog-link = Print using the system dialog…
+
+printui-primary-button = Print
+printui-primary-button-save = Save
+printui-cancel-button = Cancel
+printui-close-button = Close
+
+printui-loading = Preparing Preview
+
+# Reported by screen readers and other accessibility tools to indicate that
+# the print preview has focus.
+printui-preview-label =
+    .aria-label = Print Preview
+
+printui-pages-per-sheet = Pages per sheet
+
+# This is shown next to the Print button with an indefinite loading spinner
+# when the user prints a page and it is being sent to the printer.
+printui-print-progress-indicator = Printing…
+printui-print-progress-indicator-saving = Saving…
+
+## Paper sizes that may be supported by the Save to PDF destination:
+
+printui-paper-a5 = A5
+printui-paper-a4 = A4
+printui-paper-a3 = A3
+printui-paper-a2 = A2
+printui-paper-a1 = A1
+printui-paper-a0 = A0
+printui-paper-b5 = B5
+printui-paper-b4 = B4
+printui-paper-jis-b5 = JIS-B5
+printui-paper-jis-b4 = JIS-B4
+printui-paper-letter = US Letter
+printui-paper-legal = US Legal
+printui-paper-tabloid = Tabloid
+
+## Error messages shown when a user has an invalid input
+
+printui-error-invalid-scale = Scale must be a number between 10 and 200.
+printui-error-invalid-margin = Please enter a valid margin for the selected paper size.
+
+# Variables
+# $numPages (integer) - Number of pages
+printui-error-invalid-range = Range must be a number between 1 and { $numPages }.
+printui-error-invalid-start-overflow = The “from” page number must be smaller than the “to” page number.
diff --git a/toolkit/locales/en-US/toolkit/updates/elevation.ftl b/toolkit/locales/en-US/toolkit/updates/elevation.ftl
new file mode 100644
index 0000000000..cff601a3db
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/updates/elevation.ftl
@@ -0,0 +1,22 @@
+# 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/.
+# This is temporary until bug 1521632 is fixed
+
+elevation-update-wizard =
+  .title = Software Update
+elevation-details-link-label =
+  .value = Details
+elevation-error-manual =
+  You can update { -brand-short-name } manually by visiting this link
+  and downloading the latest version:
+elevation-finished-page = Update Ready to Install
+elevation-finished-background-page =
+  A security and stability update for { -brand-short-name } has been
+  downloaded and is ready to be installed.
+elevation-finished-background = Update:
+elevation-more-elevated =
+  This update requires administrator privileges. The update will be
+  installed the next time { -brand-short-name } starts. You can restart
+  { -brand-short-name } now, continue working and restart later, or decline this
+  update.
diff --git a/toolkit/locales/en-US/toolkit/updates/history.ftl b/toolkit/locales/en-US/toolkit/updates/history.ftl
new file mode 100644
index 0000000000..cfcdab5367
--- /dev/null
+++ b/toolkit/locales/en-US/toolkit/updates/history.ftl
@@ -0,0 +1,27 @@
+# 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/.
+
+history-title = Update History
+history-intro = The following updates have been installed
+
+close-button-label =
+    .buttonlabelcancel = Close
+    .title = Update History
+
+no-updates-label = No updates installed yet
+name-header = Update Name
+date-header = Install Date
+type-header = Type
+state-header = State
+
+# Used to display update history
+#
+# Variables:
+#   $name (String): name of the update
+#   $buildID (String): build identifier from the local updates.xml
+update-full-build-name = { $name } ({ $buildID })
+
+update-details = Details
+update-installed-on = Installed on: { $date }
+update-status = Status: { $status }