Merging upstream version 126.0.

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

23 files changed, 314 insertions, 44 deletions

diff --git a/l10n-cy/browser/browser/accounts.ftl b/l10n-cy/browser/browser/accounts.ftl
index 3eeecf1232..c3f1d26396 100644
--- a/l10n-cy/browser/browser/accounts.ftl
+++ b/l10n-cy/browser/browser/accounts.ftl
@@ -5,14 +5,11 @@
 # Used as the FxA toolbar menu item value when user has not
 # finished setting up an account.
 account-finish-account-setup = Gorffen Creu Cyfrif
-
 # Used as the FxA toolbar menu item title when the user
 # needs to reconnect their account.
 account-disconnected2 = Datgysylltwyd y cyfrif
-
 # Menu item that sends a tab to all synced devices.
 account-send-to-all-devices = Anfon i Bob Dyfais
-
 # Menu item that links to the Firefox Accounts settings for connected devices.
 account-manage-devices = Rheoli Dyfeisiadau…
 
@@ -32,10 +29,8 @@ account-manage-devices-titlecase = Rheoli Dyfeisiadau…
 
 # Redirects to a marketing page.
 account-send-tab-to-device-singledevice-status = Dim Dyfais wedi ei Gysylltu
-
 # Redirects to a marketing page.
 account-send-tab-to-device-singledevice-learnmore = Dysgu am Anfon Tabiau…
-
 # Redirects to an FxAccounts page that tells to you to connect another device.
 account-send-tab-to-device-connectdevice = Cysylltu Dyfais Arall…
 
@@ -50,17 +45,16 @@ account-send-tab-to-device-verify = Gwiriwch eich Cyfrif…
 # The title shown in a notification when either this device or another device
 # has connected to, or disconnected from, a Firefox account.
 account-connection-title = { -fxaccount-brand-name(capitalization: "title") }
-
+# The title shown in a notification when either this device or another device
+# has connected to, or disconnected from, a Firefox account.
+account-connection-title-2 = Cyfrif
 # Variables:
 #   $deviceName (String): the name of the new device
 account-connection-connected-with = Mae'r cyfrifiadur hwn bellach wedi'i gysylltu i { $deviceName }.
-
 # Used when the name of the new device is not known.
 account-connection-connected-with-noname = Mae'r cyfrifiadur hwn bellach wedi'i gysylltu i ddyfais newydd.
-
 # Used in a notification shown after a Firefox account is connected to the current device.
 account-connection-connected = Rydych wedi mewngofnodi'n llwyddiannus
-
 # Used in a notification shown after the Firefox account was disconnected remotely.
 account-connection-disconnected = Mae'r cyfrifiadur hwn wedi'i ddatgysylltu.
 
@@ -72,7 +66,6 @@ account-single-tab-arriving-title = Tab wedi'i Dderbyn
 # Variables:
 #   $deviceName (String): the device name.
 account-single-tab-arriving-from-device-title = Tab gan { $deviceName }
-
 # Used when a tab from a remote device arrives but the URL must be truncated.
 # Should display the URL with an indication that it's been truncated.
 # Variables:
@@ -85,7 +78,6 @@ account-single-tab-arriving-truncated-url = { $url }…
 ##   $tabCount (Number): the number of tabs received
 
 account-multiple-tabs-arriving-title = Tab wedi'i Dderbyn
-
 # Variables:
 #   $deviceName (String): the device name.
 account-multiple-tabs-arriving-from-single-device =
diff --git a/l10n-cy/browser/browser/browser.ftl b/l10n-cy/browser/browser/browser.ftl
index 08f4026c66..d12bae70d3 100644
--- a/l10n-cy/browser/browser/browser.ftl
+++ b/l10n-cy/browser/browser/browser.ftl
@@ -621,6 +621,12 @@ urlbar-result-action-copy-to-clipboard = Copïo
 #  $result (String): the string representation for a formula result
 urlbar-result-action-calculator-result = = { $result }
 
+## Strings used for buttons in the urlbar
+
+# Label prompting user to search with a particular search engine.
+#  $engine (String): the name of a search engine that searches a specific site
+urlbar-result-search-with = Chwilio gyda { $engine }
+
 ## Action text shown in urlbar results, usually appended after the search
 ## string or the url, like "result value - action text".
 ## In these actions "Search" is a verb, followed by where the search is performed.
@@ -927,6 +933,15 @@ data-reporting-notification-button =
     .accesskey = D
 # Label for the indicator shown in the private browsing window titlebar.
 private-browsing-indicator-label = Pori preifat
+# Tooltip for the indicator shown in the window titlebar when content analysis is active.
+# Variables:
+#   $agentName (String): The name of the DLP agent that is connected
+content-analysis-indicator-tooltip =
+    .tooltiptext = Atal colli data (DLP) gan { $agentName }. Cliciwch am fwy o wybodaeth.
+content-analysis-panel-title = Diogelu data
+# Variables:
+#   $agentName (String): The name of the DLP agent that is connected
+content-analysis-panel-text = Mae eich sefydliad yn defnyddio { $agentName } i ddiogelu rhag colli data. <a data-l10n-name="info">Dysgu rhagor</a>
 
 ## Unified extensions (toolbar) button
 
diff --git a/l10n-cy/browser/browser/confirmationHints.ftl b/l10n-cy/browser/browser/confirmationHints.ftl
index 1f23aa98d6..8d3af15cf6 100644
--- a/l10n-cy/browser/browser/confirmationHints.ftl
+++ b/l10n-cy/browser/browser/confirmationHints.ftl
@@ -22,3 +22,14 @@ confirmation-hint-send-to-device = Anfonwyd!
 confirmation-hint-firefox-relay-mask-created = Arallenw newydd wedi'i greu!
 confirmation-hint-firefox-relay-mask-reused = Arallenw cyfredol wedi'i ailddefnyddio!
 confirmation-hint-screenshot-copied = Llun sgrin wedi'i gopïo!
+# Variables:
+#   $tabCount (Number): The number of duplicate tabs closed, at least 1.
+confirmation-hint-duplicate-tabs-closed =
+    { $tabCount ->
+        [zero] Wedi cau { $tabCount } tabiau
+        [one] Wedi cau { $tabCount } tab
+        [two] Wedi cau { $tabCount } tab
+        [few] Wedi cau { $tabCount } tab
+        [many] Wedi cau { $tabCount } tab
+       *[other] Wedi cau { $tabCount } tab
+    }
diff --git a/l10n-cy/browser/browser/defaultBrowserNotification.ftl b/l10n-cy/browser/browser/defaultBrowserNotification.ftl
index 2ea77bdeb0..386d756311 100644
--- a/l10n-cy/browser/browser/defaultBrowserNotification.ftl
+++ b/l10n-cy/browser/browser/defaultBrowserNotification.ftl
@@ -21,3 +21,20 @@ default-browser-prompt-message-alt = Cael cyflymder, diogelwch a phreifatrwydd b
 default-browser-prompt-button-primary-alt = Gosod fel y porwr ragosodedig
 default-browser-prompt-checkbox-not-again-label = Peidio â dangos y neges hon eto
 default-browser-prompt-button-secondary = Nid nawr
+
+## Strings for a Windows native guidance notification when the user is forced to
+## use Windows Settings to set the default browser. Instructions differ for
+## Windows 10 and 11.
+
+default-browser-guidance-notification-title = Cwblhau gwneud { -brand-short-name } eich rhagosodiad
+# Quoted text are keywords to look for in the Windows Settings app.
+default-browser-guidance-notification-body-instruction-win10 =
+    Cam 1: Ewch i Gosodiadau> Apiau rhagosodedig
+    Cam 2: Sgroliwch i lawr i "Porwr gwe"
+    Cam 3: Dewiswch a chlicio { -brand-short-name }
+# Quoted text are keywords to look for in the Windows Settings app.
+default-browser-guidance-notification-body-instruction-win11 =
+    Cam 1: Ewch i Gosodiadau> Apiau rhagosodedig
+    Cam 2: Dewiswch “Gosod y rhagosodiad” ar gyfer { -brand-short-name }
+default-browser-guidance-notification-info-page = Dangos i mi
+default-browser-guidance-notification-dismiss = Gorffen
diff --git a/l10n-cy/browser/browser/newtab/asrouter.ftl b/l10n-cy/browser/browser/newtab/asrouter.ftl
index 31362270a8..b712e8d7fb 100644
--- a/l10n-cy/browser/browser/newtab/asrouter.ftl
+++ b/l10n-cy/browser/browser/newtab/asrouter.ftl
@@ -71,6 +71,7 @@ cfr-doorhanger-extension-total-users =
 
 cfr-doorhanger-bookmark-fxa-header = Cydweddu eich nodau tudalen ym mhob man
 cfr-doorhanger-bookmark-fxa-body = Mae hwn yn dda! Peidiwch bod heb y nod tudalen hon ar eich dyfeisiau symudol. Dechrau arni gyda { -fxaccount-brand-name }.
+cfr-doorhanger-bookmark-fxa-body-2 = Mae hwn yn dda! Peidiwch bod heb y nod tudalen hon ar eich dyfeisiau symudol. Dechreuwch arni gyda chyfrif
 cfr-doorhanger-bookmark-fxa-link-text = Cydweddu nodau tudalen nawr…
 cfr-doorhanger-bookmark-fxa-close-btn-tooltip =
     .aria-label = Cau botwm
@@ -216,8 +217,6 @@ cfr-cbh-confirm-button = Gwrthod baneri cwci
     .accesskey = G
 cfr-cbh-dismiss-button = Nid nawr
     .accesskey = N
-cookie-banner-blocker-cfr-header = Mae { -brand-short-name } newydd rwystro cwcis ar eich cyfer
-cookie-banner-blocker-cfr-body = Rydym yn gwrthod llawer o lamlenni cwcis yn awtomatig i'w gwneud hi'n anodd i wefannau eich tracio chi.
 cookie-banner-blocker-onboarding-header = Mae { -brand-short-name } newydd wrthod baner cwci drosoch chi
 cookie-banner-blocker-onboarding-body = Llai o darfu, llai o gwcis yn eich tracio ar y wefan hon.
 cookie-banner-blocker-onboarding-learn-more = Darllen rhagor
diff --git a/l10n-cy/browser/browser/newtab/newtab.ftl b/l10n-cy/browser/browser/newtab/newtab.ftl
index a3e0f73ecb..1347c0e301 100644
--- a/l10n-cy/browser/browser/newtab/newtab.ftl
+++ b/l10n-cy/browser/browser/newtab/newtab.ftl
@@ -267,9 +267,6 @@ newtab-custom-row-selector =
 newtab-custom-sponsored-sites = Llwybrau byr wedi'u noddi
 newtab-custom-pocket-title = Argymhellir gan  { -pocket-brand-name }
 newtab-custom-pocket-subtitle = Cynnwys eithriadol wedi'i guradu gan { -pocket-brand-name }, rhan o deulu { -brand-product-name }
-newtab-custom-pocket-toggle =
-    .label = Argymhellir gan  { -pocket-brand-name }
-    .description = Cynnwys eithriadol wedi'i guradu gan { -pocket-brand-name }, rhan o deulu { -brand-product-name }
 newtab-custom-stories-toggle =
     .label = Straeon cymeradwy
     .description = Cynnwys eithriadol wedi'i gasglu gan deulu { -brand-product-name }
@@ -282,3 +279,24 @@ newtab-custom-recent-toggle =
     .description = Detholiad o wefannau a chynnwys diweddar
 newtab-custom-close-button = Cau
 newtab-custom-settings = Rheoli rhagor o osodiadau
+
+## New Tab Wallpapers
+
+newtab-wallpaper-title = Papurau wal
+newtab-wallpaper-reset = Ailosod i'r rhagosodiad
+newtab-wallpaper-light-red-panda = Panda coch
+newtab-wallpaper-light-mountain = Mynydd gwyn
+newtab-wallpaper-light-sky = Awyr gyda chymylau porffor a phinc
+newtab-wallpaper-light-color = Siapiau glas, pinc a melyn
+newtab-wallpaper-light-landscape = Tirwedd mynydd a niwlen las
+newtab-wallpaper-light-beach = Traeth gyda phalmwydd
+newtab-wallpaper-dark-aurora = Aurora Borealis
+newtab-wallpaper-dark-color = Siapiau coch a glas
+newtab-wallpaper-dark-panda = Panda coch wedi'i guddio yn y goedwig
+newtab-wallpaper-dark-sky = Tirwedd y ddinas gydag awyr y nos
+newtab-wallpaper-dark-mountain = Tirwedd mynydd
+newtab-wallpaper-dark-city = Tirwedd dinas borffor
+# Variables
+#   $author_string (String) - The name of the creator of the photo.
+#   $webpage_string (String) - The name of the webpage where the photo is located.
+newtab-wallpaper-attribution = Llun gan <a data-l10n-name="name-link">{ $author_string }</a> ar <a data-l10n-name="webpage-link">{ $webpage_string }</a>
diff --git a/l10n-cy/browser/browser/newtab/onboarding.ftl b/l10n-cy/browser/browser/newtab/onboarding.ftl
index 4242f66941..b21aa08e49 100644
--- a/l10n-cy/browser/browser/newtab/onboarding.ftl
+++ b/l10n-cy/browser/browser/newtab/onboarding.ftl
@@ -53,6 +53,9 @@ mr1-onboarding-import-primary-button-label-attribution = Mewnforio o { $previous
 mr1-onboarding-theme-header = Ei wneud eich un chi
 mr1-onboarding-theme-subtitle = Personoli { -brand-short-name } gyda thema.
 mr1-onboarding-theme-secondary-button-label = Nid nawr
+newtab-wallpaper-onboarding-title = Ychwanegwch bach o liw
+newtab-wallpaper-onboarding-subtitle = Dewiswch bapur wal i roi golwg newydd i'ch Tab Newydd.
+newtab-wallpaper-onboarding-primary-button-label = Gosod y papur wal
 # System theme uses operating system color settings
 mr1-onboarding-theme-label-system = Thema'r system
 mr1-onboarding-theme-label-light = Golau
diff --git a/l10n-cy/browser/browser/policies/policies-descriptions.ftl b/l10n-cy/browser/browser/policies/policies-descriptions.ftl
index 3a6145e6f6..9e10feef0c 100644
--- a/l10n-cy/browser/browser/policies/policies-descriptions.ftl
+++ b/l10n-cy/browser/browser/policies/policies-descriptions.ftl
@@ -39,8 +39,11 @@ policy-DisableAppUpdate = Rhwystro'r wefan rhag diweddaru.
 policy-DisableBuiltinPDFViewer = Analluogi PDF.js, y dangosydd PDF mewnol yn { -brand-short-name }.
 policy-DisableDefaultBrowserAgent = Atal asiant y porwr rhagosodedig rhag cymryd unrhyw gamau. Dim ond yn berthnasol i Windows; nid oes gan lwyfannau eraill yr asiant.
 policy-DisableDeveloperTools = Rhwystro mynediad at yr offer datblygwr.
+policy-DisableEncryptedClientHello = Analluogi defnydd o'r nodwedd TLS wedi'i Amgryptio Cleient Hello (ECH).
 policy-DisableFeedbackCommands = Analluogi gorchmynion rhag anfon adborth o'r ddewislen Cymorth (Cyflwyno Adborth ac Adrodd ar Wefan Dwyllodrus).
 policy-DisableFirefoxAccounts = Analluogi gwasanaethau'n seiliedig ar { -fxaccount-brand-name }, gan gynnwys Sync.
+# This string is in the process of being deprecated in favor of policy-DisableAccounts.
+policy-DisableFirefoxAccounts1 = Analluogi gwasanaethau sy'n seiliedig ar gyfrifon, gan gynnwys cydweddu.
 # Firefox Screenshots is the name of the feature, and should not be translated.
 policy-DisableFirefoxScreenshots = Analluogi nodwedd Firefox Screenshots.
 policy-DisableFirefoxStudies = Rhwystro { -brand-short-name } rhag rhedeg astudiaethau.
diff --git a/l10n-cy/browser/browser/preferences/preferences.ftl b/l10n-cy/browser/browser/preferences/preferences.ftl
index 1aa4af4d1b..7df4d3514b 100644
--- a/l10n-cy/browser/browser/preferences/preferences.ftl
+++ b/l10n-cy/browser/browser/preferences/preferences.ftl
@@ -590,7 +590,7 @@ home-prefs-recommended-by-description-generic = Cynnwys eithriadol wedi'i gasglu
 
 home-prefs-recommended-by-learn-more = Sut mae'n gweithio
 home-prefs-recommended-by-option-sponsored-stories =
-    .label = Straeon wedi eu Noddi
+    .label = Straeon wedi’u noddi
 home-prefs-recommended-by-option-recent-saves =
     .label = Dangos Eitemau wedi'u Cadw'n Diweddar
 home-prefs-highlights-option-visited-pages =
@@ -906,7 +906,7 @@ forms-breach-alerts =
     .accesskey = r
 forms-breach-alerts-learn-more-link = Darllen rhagor
 preferences-relay-integration-checkbox =
-    .label = Awgrymu arallewnau e-byst { -relay-brand-name } i ddiogelu eich cyfeiriad e-bost
+    .label = Awgrymu arallenwau e-byst { -relay-brand-name } i ddiogelu eich cyfeiriad e-bost
 preferences-relay-integration-checkbox2 =
     .label = Awgrymu arallenwau e-byst { -relay-brand-name } i ddiogelu eich cyfeiriad e-bost
     .accesskey = w
diff --git a/l10n-cy/browser/browser/screenshots.ftl b/l10n-cy/browser/browser/screenshots.ftl
index 05c9e7b17e..d30e783827 100644
--- a/l10n-cy/browser/browser/screenshots.ftl
+++ b/l10n-cy/browser/browser/screenshots.ftl
@@ -5,10 +5,8 @@
 screenshot-toolbarbutton =
     .label = Llun Sgrin
     .tooltiptext = Cymryd llun sgrin
-
 screenshot-shortcut =
     .key = S
-
 screenshots-instructions = Llusgwch neu glicio ar y dudalen i ddewis ardal. Pwyso ESC i ddiddymu.
 screenshots-cancel-button = Diddymu
 screenshots-save-visible-button = Cadw'r gweladwy
@@ -25,7 +23,6 @@ screenshots-cancel-button-title =
     .title = Diddymu
 screenshots-retry-button-title =
     .title = Cymryd sgrin llun eto
-
 screenshots-meta-key =
     { PLATFORM() ->
         [macos] ⌘
@@ -33,28 +30,62 @@ screenshots-meta-key =
     }
 screenshots-notification-link-copied-title = Dolen wedi ei Chadw
 screenshots-notification-link-copied-details = Mae'r ddolen i'ch llun wedi ei gopïo i'r clipfwrdd. Pwyswch { screenshots-meta-key }-V i'w ludo.
-
 screenshots-notification-image-copied-title = Copïwyd y Llun
 screenshots-notification-image-copied-details = Mae eich llun wedi ei gopïo i'r clipfwrdd. Pwyswch { screenshots-meta-key }-V i'w ludo.
-
 screenshots-request-error-title = Ddim yn gweithio.
 screenshots-request-error-details = Ymddiheuriadau! Nid oedd modd cadw eich llun. Ceisiwch eto'n hwyrach.
-
 screenshots-connection-error-title = Nid oes modd i ni gysylltu a'ch lluniau sgrin.
 screenshots-connection-error-details = Gwiriwch eich cysylltiad Rhyngrwyd. Os ydych yn gallu cysylltu â'r Rhyngrwyd, efallai bod anhawster dros dro gyda gwasanaeth lluniau sgrin, { -screenshots-brand-name }.
-
 screenshots-login-error-details = Nid oedd modd i ni gadw eich llun gan fod yna anhawster gyda gwasanaeth { -screenshots-brand-name }. Ceisiwch eto'n hwyrach.
-
 screenshots-unshootable-page-error-title = Nid oes modd tynnu llun sgrin o'r dudalen.
 screenshots-unshootable-page-error-details = Nid yw hwn yn dudalen Gwe safonol, felly does dim modd tynnu llun sgrin ohono.
-
 screenshots-empty-selection-error-title = Mae eich dewis yn rhy fach
-
 screenshots-private-window-error-title = Mae { -screenshots-brand-name } wedi ei analluogi yn y Modd Pori Preifat
 screenshots-private-window-error-details = Ymddiheuriadau am yr anhwylustod. Rydym yn gweithio ar y nodwedd hwn ar gyfer fersiynau'r dyfodol.
-
 screenshots-generic-error-title = Www! Mae { -screenshots-brand-name } wedi mynd yn hurt.
 screenshots-generic-error-details = Nid ydym yn gwybod beth sydd wedi ddigwydd. Ceisiwch eto neu dynnu llun o dudalen wahanol?
-
 screenshots-too-large-error-title = Cafodd eich llun sgrin ei docio am ei fod yn rhy fawr
 screenshots-too-large-error-details = Ceisiwch ddewis ardal sy'n llai na 32,700 picsel ar ei ochr hiraf neu gyfanswm arwynebedd o 124,900,000 picsel.
+screenshots-component-retry-button =
+    .title = Cymryd sgrin llun eto
+    .aria-label = Cymryd sgrin llun eto
+screenshots-component-cancel-button =
+    .title =
+        { PLATFORM() ->
+            [macos] Diddymu (Esc)
+           *[other] Diddymu (Esc)
+        }
+    .aria-label = Diddymu
+# Variables
+#   $shortcut (String) - A keyboard shortcut for copying the screenshot.
+screenshots-component-copy-button =
+    .title = Copïo ( { $shortcut } )
+    .aria-label = Copïo
+screenshots-component-copy-button-label = Copïo
+# Variables
+#   $shortcut (String) - A keyboard shortcut for saving/downloading the screenshot.
+screenshots-component-download-button =
+    .title = Llwytho i lawr ( { $shortcut } )
+    .aria-label = Llwytho i lawr
+screenshots-component-download-button-label = Llwytho i lawr
+
+## The below strings are used to capture keydown events so the strings should
+## not be changed unless the keyboard layout in the locale requires it.
+
+screenshots-component-download-key = S
+screenshots-component-copy-key = C
+
+##
+
+# This string represents the selection size area
+# "x" here represents "by" (i.e 123 by 456)
+# Variables:
+#   $width (Number) - The width of the selection region in pixels
+#   $height (Number) - The height of the selection region in pixels
+screenshots-overlay-selection-region-size-2 = { $width } x { $height }
+# This string represents the selection size area
+# "×" here represents "by" (i.e 123 by 456)
+# Variables:
+#   $width (Number) - The width of the selection region in pixels
+#   $height (Number) - The height of the selection region in pixels
+screenshots-overlay-selection-region-size-3 = { $width } × { $height }
diff --git a/l10n-cy/browser/browser/tabContextMenu.ftl b/l10n-cy/browser/browser/tabContextMenu.ftl
index e2d8742881..b0cc30ae48 100644
--- a/l10n-cy/browser/browser/tabContextMenu.ftl
+++ b/l10n-cy/browser/browser/tabContextMenu.ftl
@@ -72,6 +72,9 @@ move-to-new-window =
 tab-context-close-multiple-tabs =
     .label = Cau Tabiau Lluosog
     .accesskey = L
+tab-context-close-duplicate-tabs =
+    .label = Cau Tabiau Dyblyg
+    .accesskey = T
 tab-context-share-url =
     .label = Rhannu
     .accesskey = R
@@ -115,7 +118,6 @@ tab-context-move-tabs =
            *[other] Symud Tab
         }
     .accesskey = S
-
 tab-context-send-tabs-to-device =
     .label =
         { $tabCount ->
diff --git a/l10n-cy/browser/browser/tabbrowser.ftl b/l10n-cy/browser/browser/tabbrowser.ftl
index d44bd18d89..02aa55ac33 100644
--- a/l10n-cy/browser/browser/tabbrowser.ftl
+++ b/l10n-cy/browser/browser/tabbrowser.ftl
@@ -165,7 +165,7 @@ tabbrowser-context-mute-tab =
     .label = Tewi Tab
     .accesskey = T
 tabbrowser-context-unmute-tab =
-    .label = Tab Dad-dewi
+    .label = Dad-dewi Tab
     .accesskey = D
 # The accesskey should match the accesskey for tabbrowser-context-mute-tab
 tabbrowser-context-mute-selected-tabs =
diff --git a/l10n-cy/browser/browser/translations.ftl b/l10n-cy/browser/browser/translations.ftl
index c1b0c5a053..7cd272b8c4 100644
--- a/l10n-cy/browser/browser/translations.ftl
+++ b/l10n-cy/browser/browser/translations.ftl
@@ -126,8 +126,6 @@ translations-manage-description = Llwythwch i lawr ieithoedd ar gyfer cyfieithu
 translations-manage-all-language = Pob iaith
 translations-manage-download-button = Llwytho i lawr
 translations-manage-delete-button = Dileu
-translations-manage-error-download = Bu anhawster wrth lwytho'r ffeiliau iaith i lawr. Ceisiwch eto.
-translations-manage-error-delete = Bu gwall wrth ddileu'r ffeiliau iaith. Ceisiwch eto.
 translations-manage-intro = Gosodwch eich dewisiadau cyfieithu iaith a gwefan a rheoli ieithoedd sydd wedi'u gosod ar gyfer cyfieithu all-lein.
 translations-manage-install-description = Gosodwch ieithoedd ar gyfer cyfieithu all-lein
 translations-manage-language-install-button =
@@ -135,12 +133,21 @@ translations-manage-language-install-button =
 translations-manage-language-install-all-button =
     .label = Gosod y cyfan
     .accesskey = G
+translations-manage-intro-2 = Gosodwch eich dewisiadau iaith a chyfieithu gwefan a rheoli'r ieithoedd sydd wedi'u llwytho i lawr ar gyfer cyfieithu all-lein.
+translations-manage-download-description = Llwytho i lawr ieithoedd ar gyfer cyfieithu all-lein
+translations-manage-language-download-button =
+    .label = Llwytho i lawr
+translations-manage-language-download-all-button =
+    .label = Llwytho'r cyfan i lawr
+    .accesskey = L
 translations-manage-language-remove-button =
     .label = Tynnu
 translations-manage-language-remove-all-button =
     .label = Tynnu'r cyfan
     .accesskey = T
 translations-manage-error-install = Bu anhawster wrth osod y ffeiliau iaith. Ceisiwch eto.
+translations-manage-error-download = Bu anhawster wrth lwytho'r ffeiliau iaith i lawr. Ceisiwch eto.
+translations-manage-error-delete = Bu gwall wrth ddileu'r ffeiliau iaith. Ceisiwch eto.
 translations-manage-error-remove = Bu gwall wrth dynnu'r ffeiliau iaith. Ceisiwch eto.
 translations-manage-error-list = Wedi methu â chael y rhestr o ieithoedd sydd ar gael i'w cyfieithu. Ail-lwythwch y dudalen i geisio eto.
 translations-settings-title =
@@ -170,3 +177,75 @@ translations-settings-remove-all-sites-button =
 translations-settings-close-dialog =
     .buttonlabelaccept = Cau
     .buttonaccesskeyaccept = C
+# Text displayed in the right-click context menu for translating
+# selected text to a yet-to-be-determined language.
+main-context-menu-translate-selection =
+    .label = Cyfieithu'r adran…
+    .accesskey = a
+# Text displayed in the right-click context menu for translating
+# selected text to a target language.
+#
+# Variables:
+#   $language (string) - The localized display name of the target language
+main-context-menu-translate-selection-to-language =
+    .label = Cyfieithu'r adran i { $language }
+    .accesskey = y
+# Text displayed in the right-click context menu for translating
+# the text of a hyperlink to a yet-to-be-determined language.
+main-context-menu-translate-link-text =
+    .label = Cyfieithu Testun Dolen…
+    .accesskey = D
+# Text displayed in the right-click context menu for translating
+# the text of a hyperlink to a target language.
+#
+# Variables:
+#   $language (string) - The localized display name of the target language
+main-context-menu-translate-link-text-to-language =
+    .label = Cyfieithu Testun Dolen i { $language }
+    .accesskey = T
+# Text displayed in the select translations panel header.
+select-translations-panel-header = Cyfieithu
+# Text displayed above the from-language dropdown menu.
+select-translations-panel-from-label = O
+# Text displayed above the to-language dropdown menu.
+select-translations-panel-to-label = I'r
+# Text displayed above the try-another-source-language dropdown menu.
+select-translations-panel-try-another-language-label = Rhowch gynnig ar iaith ffynhonnell arall
+select-translations-panel-cancel-button =
+    .label = Diddymu
+# Text displayed on the copy button before it is clicked.
+select-translations-panel-copy-button =
+    .label = Copïo
+# Text displayed on the copy button after it is clicked.
+select-translations-panel-copy-button-copied =
+    .label = Wedi'i gopïo
+select-translations-panel-done-button =
+    .label = Gorffen
+select-translations-panel-translate-full-page-button =
+    .label = Cyfieithu'r dudalen lawn
+select-translations-panel-translate-button =
+    .label = Cyfieithu
+select-translations-panel-try-again-button =
+    .label = Ceisiwch eto
+# Text displayed as a placeholder when the panel is idle.
+select-translations-panel-idle-placeholder-text = Bydd testun wedi'i gyfieithu yn ymddangos yma.
+# Text displayed as a placeholder when the panel is actively translating.
+select-translations-panel-translating-placeholder-text = Wrthi'n cyfieithu…
+select-translations-panel-init-failure-message =
+    .message = Methu llwytho ieithoedd. Gwiriwch eich cysylltiad rhyngrwyd a rhowch gynnig arall arni.
+# Text displayed when the translation fails to complete.
+select-translations-panel-translation-failure-message =
+    .message = Bu anhawster wrth gyfieithu. Ceisiwch eto.
+# If your language requires declining the language name, a possible solution
+# is to adapt the structure of the phrase, or use a support noun, e.g.
+# `Sorry, we don't support the language yet: { $language }
+#
+# Variables:
+#   $language (string) - The language of the document.
+select-translations-panel-unsupported-language-message-known =
+    .message = Mae'n ddrwg gennym, nid ydym yn cefnogi'r { $language } eto.
+select-translations-panel-unsupported-language-message-unknown =
+    .message = Ymddiheuriadau, nid ydym yn cefnogi'r { $language } eto.
+# Text displayed on the menuitem that opens the Translation Settings page.
+select-translations-panel-open-translations-settings-menuitem =
+    .label = Gosodiadau cyfieithu
diff --git a/l10n-cy/browser/browser/webProtocolHandler.ftl b/l10n-cy/browser/browser/webProtocolHandler.ftl
index 671049c268..d9c99e4edb 100644
--- a/l10n-cy/browser/browser/webProtocolHandler.ftl
+++ b/l10n-cy/browser/browser/webProtocolHandler.ftl
@@ -14,6 +14,8 @@ protocolhandler-mailto-handler-notificationbox-always = Agor dolenni e-bost gan
 protocolhandler-mailto-handler-yes-confirm = { $url } yw eich gwefan rhagosodedig ar gyfer agor dolenni sy'n anfon e-byst.
 protocolhandler-mailto-handler-set-message = Defnyddio <strong>{ $url } yn { -brand-short-name }</strong> bob tro y byddwch yn clicio ar ddolen sy'n agor eich e-bost?
 protocolhandler-mailto-handler-confirm-message = <strong>{ $url } yn { -brand-short-name }</strong> yw triniwr e-bost rhagosodedig eich cyfrifiadur bellach.
+protocolhandler-mailto-handler-set = Defnyddio <strong>{ $url } yn { -brand-short-name }</strong> bob tro y byddwch yn clicio ar ddolen sy'n agor eich e-bost?
+protocolhandler-mailto-handler-confirm = Bydd <strong>{ -brand-short-name } yn agor { $url }</strong> bob tro y byddwch yn clicio ar ddolen sy'n anfon e-bost.
 
 ##
 
diff --git a/l10n-cy/browser/chrome/browser/browser.properties b/l10n-cy/browser/chrome/browser/browser.properties
index 3fa3daaac9..2bcb281cab 100644
--- a/l10n-cy/browser/chrome/browser/browser.properties
+++ b/l10n-cy/browser/chrome/browser/browser.properties
@@ -157,6 +157,11 @@ webauthn.anonymize=Gwneud yn anhysbys
 # Spoof Accept-Language prompt
 privacy.spoof_english=O bosib gall newid eich gosodiad i'r iaith Saesneg eich gwneud yn fwy anodd i'ch adnabod a gwella eich preifatrwydd. Hoffech chi wneud cais am fersiynau Saesneg o dudalennau gwe?
 
+webauthn.allow=Caniatáu
+webauthn.allow.accesskey=C
+webauthn.block=Rhwystro
+webauthn.block.accesskey=R
+
 # LOCALIZATION NOTE (identity.identified.verifier, identity.identified.state_and_country, identity.ev.contentOwner2):
 # %S is the hostname of the site that is being displayed.
 identity.identified.verifier=Dilyswyd gan: %S
diff --git a/l10n-cy/dom/chrome/security/csp.properties b/l10n-cy/dom/chrome/security/csp.properties
index bd577d150e..a161f7c0a9 100644
--- a/l10n-cy/dom/chrome/security/csp.properties
+++ b/l10n-cy/dom/chrome/security/csp.properties
@@ -218,6 +218,16 @@ duplicateDirective = Mae cyfarwyddebau %1$S dyblyg wedi eu canfod.  Bydd yr holl
 # %1$S is the option that could not be understood
 couldntParseInvalidSandboxFlag = Methu didoli baner blwch tywod annilys ‘%1$S’
 
+# LOCALIZATION NOTE (invalidNumberOfTrustedTypesForDirectiveValues):
+# %1$S is the number of passed tokens.
+invalidNumberOfTrustedTypesForDirectiveValues = Wedi derbyn nifer annilys o docynnau ar gyfer y gyfarwyddeb ‘require-trusted-types-for’: %1$S; yn disgwyl 1
+# LOCALIZATION NOTE (invalidRequireTrustedTypesForDirectiveValue):
+# %1$S is the passed token
+invalidRequireTrustedTypesForDirectiveValue = Wedi derbyn tocyn annilys ar gyfer y gyfarwyddeb ‘require-trusted-types-for’: %1$S; yn disgwyl ‘script’
+# LOCALIZATION NOTE (invalidTrustedTypesExpression):
+# %1$S is the passed token
+invalidTrustedTypesExpression = Wedi derbyn tocyn annilys ar gyfer y gyfarwyddeb ‘types trusted’: %1$S
+
 # LOCALIZATION NOTE (CSPMessagePrefix):
 # Do not translate "Content-Security-Policy", only handle spacing for the colon.
 # %S is a console message that is being prefixed here.
diff --git a/l10n-cy/mobile/android/chrome/browser.properties b/l10n-cy/mobile/android/chrome/browser.properties
index 0704568c0d..269f3af06c 100644
--- a/l10n-cy/mobile/android/chrome/browser.properties
+++ b/l10n-cy/mobile/android/chrome/browser.properties
@@ -42,3 +42,4 @@ userContextWork.label = Gwaith
 userContextBanking.label = Bancio
 userContextShopping.label = Siopa
 
+
diff --git a/l10n-cy/mobile/android/chrome/passwordmgr.properties b/l10n-cy/mobile/android/chrome/passwordmgr.properties
index 849962bf0f..9f7dc168a9 100644
--- a/l10n-cy/mobile/android/chrome/passwordmgr.properties
+++ b/l10n-cy/mobile/android/chrome/passwordmgr.properties
@@ -18,3 +18,4 @@ passwordChangeTitle=Cadarnhau Newid Cyfrinair
 
 username=Enw Defnyddiwr
 password=Cyfrinair
+
diff --git a/l10n-cy/mobile/android/mobile/android/aboutConfig.ftl b/l10n-cy/mobile/android/mobile/android/aboutConfig.ftl
index eb389d4031..f27b068211 100644
--- a/l10n-cy/mobile/android/mobile/android/aboutConfig.ftl
+++ b/l10n-cy/mobile/android/mobile/android/aboutConfig.ftl
@@ -6,11 +6,9 @@ config-toolbar-search =
     .placeholder = Chwilio
 config-new-pref-name =
     .placeholder = Enw
-
-config-new-pref-value-boolean = Booleaidd
-config-new-pref-value-string = Llinell
+config-new-pref-value-boolean = Boole
+config-new-pref-value-string = Llinyn
 config-new-pref-value-integer = Cyfanrif
-
 config-new-pref-string =
     .placeholder = Rhowch linyn
 config-new-pref-number =
@@ -18,10 +16,8 @@ config-new-pref-number =
 config-new-pref-cancel-button = Diddymu
 config-new-pref-create-button = Creu
 config-new-pref-change-button = Newid
-
 config-pref-toggle-button = Toglo
 config-pref-reset-button = Ailosod
-
 config-context-menu-copy-pref-name =
     .label = Copïo Enw
 config-context-menu-copy-pref-value =
diff --git a/l10n-cy/mobile/android/mobile/android/geckoViewConsole.ftl b/l10n-cy/mobile/android/mobile/android/geckoViewConsole.ftl
index 04cccd0751..2ecbb2949f 100644
--- a/l10n-cy/mobile/android/mobile/android/geckoViewConsole.ftl
+++ b/l10n-cy/mobile/android/mobile/android/geckoViewConsole.ftl
@@ -20,3 +20,4 @@ console-timer-start = { $name }: amserydd wedi cychwyn
 #   $name (String): user-defined name for the timer
 #   $duration (String): number of milliseconds
 console-timer-end = { $name }: { $duration }ms
+
diff --git a/l10n-cy/toolkit/toolkit/about/aboutReader.ftl b/l10n-cy/toolkit/toolkit/about/aboutReader.ftl
index 1d6278b22c..809c734ab8 100644
--- a/l10n-cy/toolkit/toolkit/about/aboutReader.ftl
+++ b/l10n-cy/toolkit/toolkit/about/aboutReader.ftl
@@ -26,6 +26,18 @@ about-reader-color-theme-contrast = Cyferbyniad
     .title = Cyferbyniad Lliw Thema
 about-reader-color-theme-custom = Lliwiau cyfaddas
     .title = Lliwiau Thema Gyfaddas
+about-reader-color-light-theme = Golau
+    .title = Thema olau
+about-reader-color-dark-theme = Tywyll
+    .title = Thema dywyll
+about-reader-color-sepia-theme = Sepia
+    .title = Thema sepia
+about-reader-color-auto-theme = Awtomatig
+    .title = Thema awtomatig
+about-reader-color-gray-theme = Llwyd
+    .title = Thema lwyd
+about-reader-color-contrast-theme = Cyferbyniol
+    .title = Thema gyferbyniol
 # An estimate for how long it takes to read an article,
 # expressed as a range covering both slow and fast readers.
 # Variables:
@@ -66,6 +78,8 @@ about-reader-font-type-sans-serif = Sans-serif
 about-reader-toolbar-close = Cau'r Golwg Darllen
 about-reader-toolbar-type-controls = Rheoli'r math
 about-reader-toolbar-color-controls = Lliwiau
+about-reader-toolbar-text-layout-controls = Testun a chynllun
+about-reader-toolbar-theme-controls = Thema
 about-reader-toolbar-savetopocket = Cadw i { -pocket-brand-name }
 
 ## Reader View colors menu
@@ -89,3 +103,28 @@ about-reader-custom-colors-visited-links = Dolenni wedi cael ymweliad
 about-reader-custom-colors-selection-highlight = Amlygwr ar gyfer darllen yn uchel
     .title = Golygu'r lliw
 about-reader-custom-colors-reset-button = Ailosod rhagosodiadau
+
+## Reader View improved text and layout menu
+
+about-reader-layout-header = Cynllun
+about-reader-advanced-layout-header = Uwch
+about-reader-slider-label-width-narrow = Cul
+about-reader-slider-label-width-wide = Llydan
+about-reader-slider-label-spacing-narrow = Cul
+about-reader-slider-label-spacing-standard = Safonol
+about-reader-slider-label-spacing-wide = Llydan
+about-reader-content-width-label =
+    .label = Lled cynnwys
+about-reader-line-spacing-label =
+    .label = Bylchu llinellau
+about-reader-character-spacing-label =
+    .label = Bylchu nodau
+about-reader-word-spacing-label =
+    .label = Bylchu geiriau
+about-reader-text-alignment-label = Aliniad testun
+about-reader-text-alignment-left =
+    .title = Alinio testun i'r chwith
+about-reader-text-alignment-center =
+    .title = Alinio testun i'r canol
+about-reader-text-alignment-right =
+    .title = Alinio'r testun i'r dde
diff --git a/l10n-cy/toolkit/toolkit/contentanalysis/contentanalysis.ftl b/l10n-cy/toolkit/toolkit/contentanalysis/contentanalysis.ftl
index 37d3168424..d74d045c03 100644
--- a/l10n-cy/toolkit/toolkit/contentanalysis/contentanalysis.ftl
+++ b/l10n-cy/toolkit/toolkit/contentanalysis/contentanalysis.ftl
@@ -6,10 +6,6 @@ contentanalysis-alert-title = Dadansoddi Cynnwys
 # Variables:
 #   $content - Description of the content being warned about, such as "clipboard" or "aFile.txt"
 contentanalysis-slow-agent-notification = Mae'r teclyn Dadansoddi Cynnwys yn cymryd amser hir i ymateb ynghylch adnodd “{ $content }”
-contentanalysis-slow-agent-dialog-title = Wrthi'n dadansoddi cynnwys
-# Variables:
-#   $content - Description of the content being warned about, such as "clipboard" or "aFile.txt"
-contentanalysis-slow-agent-dialog-body = Mae Dadansoddi Cynnwys yn dadansoddi adnodd “{ $content }”
 contentanalysis-slow-agent-dialog-header = Wrthi'n sganio
 # Variables:
 #   $agent - The name of the DLP agent doing the analysis
@@ -22,8 +18,12 @@ contentanalysis-slow-agent-dialog-body-clipboard = Mae { $agent } yn asesu'r hyn
 # Variables:
 #   $agent - The name of the DLP agent doing the analysis
 contentanalysis-slow-agent-dialog-body-dropped-text = Mae { $agent } yn asesu'r testun rydych wedi'i ollwng yn erbyn polisïau data eich sefydliad. Gall hyn gymryd ychydig o amser.
+# Variables:
+#   $agent - The name of the DLP agent doing the analysis
+contentanalysis-slow-agent-dialog-body-print = Mae { $agent } yn adolygu'r hyn a argraffwyd gennych yn erbyn polisïau data eich sefydliad. Gall hyn gymryd ychydig amser.
 contentanalysis-operationtype-clipboard = clipfwrdd
 contentanalysis-operationtype-dropped-text = testun wedi'i ostwng
+contentanalysis-operationtype-print = argraffu
 #   $filename - The filename associated with the request, such as "aFile.txt"
 contentanalysis-customdisplaystring-description = llwytho “{ $filename }” i fyny
 contentanalysis-warndialogtitle = Gall y cynnwys hwn fod yn anniogel
@@ -55,6 +55,34 @@ contentanalysis-no-agent-connected-message = Methu cysylltu â { $agent }. Gwrth
 #   $agent - The name of the DLP agent doing the analysis
 #   $content - Description of the content being blocked, such as "clipboard" or "aFile.txt"
 contentanalysis-invalid-agent-signature-message = Methwyd â dilysu llofnod ar gyfer { $agent }. Gwrthodwyd trosglwyddo adnodd: { $content }.
+# Variables:
+#   $agent - The name of the DLP agent doing the analysis
+#   $content - Localized text describing the content being blocked, such as "Paste denied."
+contentanalysis-unspecified-error-message-content = Bu gwall wrth gyfathrebu â { $agent }. { $content }
+# Variables:
+#   $agent - The name of the DLP agent doing the analysis
+#   $content - Localized text describing the content being blocked, such as "Paste denied."
+contentanalysis-no-agent-connected-message-content = Methu cysylltu â { $agent }. { $content }
+# Variables:
+#   $agent - The name of the DLP agent doing the analysis
+#   $content - Localized text describing the content being blocked, such as "Paste denied."
+contentanalysis-invalid-agent-signature-message-content = Methwyd â dilysu llofnod ar gyfer { $agent }. { $content }
+# Variables:
+#   $filename - Name of the file that was blocked, such as "aFile.txt"
+contentanalysis-error-message-upload-file = Gwrthodwyd llwytho “{ $filename }” i fyny.
+contentanalysis-error-message-dropped-text = Gwrthodwyd llusgo a gollwng.
+contentanalysis-error-message-clipboard = Gwrthodwyd gludo.
+contentanalysis-error-message-print = Gwrthodwyd argraffu.
+contentanalysis-block-dialog-title-upload-file = Nid oes caniatâd i chi lwytho'r ffeil hon
+# Variables:
+#   $filename - Name of the file that was blocked, such as "aFile.txt"
+contentanalysis-block-dialog-body-upload-file = O dan bolisïau diogelu data eich sefydliad, nid oes caniatâd i chi lwytho’r ffeil “{ $filename }”. Cysylltwch â'ch gweinyddwr am ragor o wybodaeth.
+contentanalysis-block-dialog-title-clipboard = Nid oes caniatâd i chi ludo'r ffeil hon
+contentanalysis-block-dialog-body-clipboard = O dan bolisïau diogelu data eich sefydliad, nid oes caniatâd i chi ludo'r cynnwys hwn. Cysylltwch â'ch gweinyddwr am ragor o wybodaeth.
+contentanalysis-block-dialog-title-dropped-text = Nid oes caniatâd i chi ollwng y cynnwys hwn
+contentanalysis-block-dialog-body-dropped-text = O dan bolisïau diogelu data eich sefydliad, nid oes caniatâd i chi lusgo a gollwng y cynnwys hwn. Cysylltwch â'ch gweinyddwr am ragor o wybodaeth.
+contentanalysis-block-dialog-title-print = Nid oes caniatâd i chi argraffu'r ddogfen hon
+contentanalysis-block-dialog-body-print = O dan bolisïau diogelu data eich sefydliad, nid oes caniatâd i chi argraffu’r ddogfen hon. Cysylltwch â'ch gweinyddwr am ragor o wybodaeth.
 contentanalysis-inprogress-quit-title = Gadael { -brand-shorter-name }?
 contentanalysis-inprogress-quit-message = Mae nifer o gamau gweithredu ar waith. Os byddwch yn gadael { -brand-shorter-name }, ni fydd y gweithredoedd hyn yn cael eu cwblhau.
 contentanalysis-inprogress-quit-yesbutton = Iawn, gadael
diff --git a/l10n-cy/toolkit/toolkit/global/arrowscrollbox.ftl b/l10n-cy/toolkit/toolkit/global/arrowscrollbox.ftl
index 76d14392af..296f6a2768 100644
--- a/l10n-cy/toolkit/toolkit/global/arrowscrollbox.ftl
+++ b/l10n-cy/toolkit/toolkit/global/arrowscrollbox.ftl
@@ -19,3 +19,20 @@ overflow-scroll-button-up =
 # would look like "v" and scroll the list of menuitems down.
 overflow-scroll-button-down =
     .tooltiptext = Sgrolio i lawr
+
+### This file contains the entities needed to use the Arrowscrollbox component.
+### For example, Arrowscrollboxes are used in Tabs Toolbar when there are
+### multiple tabs opened and in overflowing menus.
+
+# This button is shown at the beginning of the overflowing list of elements.
+# For example, in LTR language like English, on the Tabs Toolbar it would look
+# like "<" and scroll the tab list to the left, and in the overflowing menu it
+# would look like "^" and scroll the list of menuitems up.
+overflow-scroll-button-backwards =
+    .tooltiptext = Sgrolio am yn ôl
+# This button is shown at the end of the overflowing list of elements. For
+# example, in LTR language like English, on the Tabs Toolbar it would look like
+# ">" and scroll the tab list to the right, and in the overflowing menu it
+# would look like "v" and scroll the list of menuitems down.
+overflow-scroll-button-forwards =
+    .tooltiptext = Sgrolio ymlaen