diff --git a/l10n/ar/viewer.ftl b/l10n/ar/viewer.ftl
index 420136763..c3fb3ee96 100644
--- a/l10n/ar/viewer.ftl
+++ b/l10n/ar/viewer.ftl
@@ -201,6 +201,19 @@ pdfjs-thumb-page-title =
 #   $page (Number) - the page number
 pdfjs-thumb-page-canvas =
     .aria-label = مصغّرة صفحة { $page }
+# Variables:
+#   $page (Number) - the page number
+pdfjs-thumb-page-checkbox1 =
+    .title = حدّد الصفحة { $page }
+# Variables:
+#   $page (Number) - the page number
+pdfjs-thumb-page-checkbox =
+    .aria-label = حدّد الصفحة { $page }
+# Variables:
+#   $page (Number) - the page number
+#   $total (Number) - the number of pages
+pdfjs-thumb-page-title1 =
+    .title = الصفحة { $page } من { $total }
 
 ## Find panel button title and messages
 
@@ -294,9 +307,13 @@ pdfjs-web-fonts-disabled = خطوط الوب مُعطّلة: تعذّر استخ
 
 pdfjs-editor-free-text-button =
     .title = نص
+pdfjs-editor-color-picker-free-text-input =
+    .title = غيِّر لون النص
 pdfjs-editor-free-text-button-label = نص
 pdfjs-editor-ink-button =
     .title = ارسم
+pdfjs-editor-color-picker-ink-input =
+    .title = غيِّر لون الرسم
 pdfjs-editor-ink-button-label = ارسم
 pdfjs-editor-stamp-button =
     .title = أضِف أو حرّر الصور
@@ -308,6 +325,14 @@ pdfjs-highlight-floating-button1 =
     .title = أبرِز
     .aria-label = أبرِز
 pdfjs-highlight-floating-button-label = أبرِز
+pdfjs-comment-floating-button =
+    .title = علق
+    .aria-label = علق
+pdfjs-comment-floating-button-label = علق
+pdfjs-editor-comment-button =
+    .title = علق
+    .aria-label = علق
+pdfjs-editor-comment-button-label = التعليق
 pdfjs-editor-signature-button =
     .title = أضِف توقيع
 pdfjs-editor-signature-button-label = أضِف توقيع
@@ -370,6 +395,13 @@ pdfjs-editor-add-saved-signature-button =
 pdfjs-free-text2 =
     .aria-label = محرِّر النص
     .default-content = ابدأ في كتابة…
+pdfjs-editor-comments-sidebar-close-button =
+    .title = أغلِق الشريط الجانبي
+    .aria-label = أغلِق الشريط الجانبي
+pdfjs-editor-comments-sidebar-close-button-label = أغلِق الشريط الجانبي
+# Instructional copy to add a comment by selecting text or an annotations.
+pdfjs-editor-comments-sidebar-no-comments1 = هل رأيت شيئاً جديرًا بالملاحظة؟ ابرزه واترك تعليقًا.
+pdfjs-editor-comments-sidebar-no-comments-link = اطّلع على المزيد
 
 ## Alt-text dialog
 
@@ -500,6 +532,14 @@ pdfjs-editor-alt-text-settings-show-dialog-button-label = أظهِر مُحرّ
 pdfjs-editor-alt-text-settings-show-dialog-description = يساعدك على التأكد من أن جميع صورك تحتوي على نص بديل.
 pdfjs-editor-alt-text-settings-close-button = أغلق
 
+## Accessibility labels (announced by screen readers) for objects added to the editor.
+
+pdfjs-editor-highlight-added-alert = أُضيف إبراز
+pdfjs-editor-freetext-added-alert = أُضيف النص
+pdfjs-editor-ink-added-alert = أُضيف رسم
+pdfjs-editor-stamp-added-alert = أُضيف صورة
+pdfjs-editor-signature-added-alert = أُضيف توقيع
+
 ## "Annotations removed" bar
 
 pdfjs-editor-undo-bar-message-highlight = أُزِيل البرز
@@ -507,6 +547,7 @@ pdfjs-editor-undo-bar-message-freetext = أُزيل النص
 pdfjs-editor-undo-bar-message-ink = أُزِيلت الرسمة
 pdfjs-editor-undo-bar-message-stamp = أُزيلت الصورة
 pdfjs-editor-undo-bar-message-signature = أُزيل التوقيع
+pdfjs-editor-undo-bar-message-comment = أُزيل التعليق
 # Variables:
 #   $count (Number) - the number of removed annotations.
 pdfjs-editor-undo-bar-message-multiple =
@@ -572,6 +613,8 @@ pdfjs-editor-add-signature-save-checkbox = احفظ التوقيع
 pdfjs-editor-add-signature-save-warning-message = لقد وصلت إلى الحد الأقصى وهو 5 توقيعات محفوظة. أزِل توقيع واحد لحفظ المزيد.
 pdfjs-editor-add-signature-image-upload-error-title = تعذر رفع الصورة.
 pdfjs-editor-add-signature-image-upload-error-description = تحقق من اتصال الشبكة لديك أو جرّب صورة أخرى.
+pdfjs-editor-add-signature-image-no-data-error-title = لا يمكن تحويل هذه الصورة إلى توقيع
+pdfjs-editor-add-signature-image-no-data-error-description = من فضلك حاول رفع صورة أخرى.
 pdfjs-editor-add-signature-error-close-button = أغلق
 
 ## Dialog buttons
@@ -580,6 +623,67 @@ pdfjs-editor-add-signature-cancel-button = ألغِ
 pdfjs-editor-add-signature-add-button = أضِف
 pdfjs-editor-edit-signature-update-button = حدّث
 
+## Comment popup
+
+pdfjs-editor-edit-comment-popup-button-label = حرّر التعليق
+pdfjs-editor-edit-comment-popup-button =
+    .title = حرّر التعليق
+pdfjs-editor-delete-comment-popup-button-label = أزِل التعليق
+pdfjs-editor-delete-comment-popup-button =
+    .title = أزِل التعليق
+pdfjs-show-comment-button =
+    .title = أظهر التعليق
+
+##  Edit a comment dialog
+
+# An existing comment is edited
+pdfjs-editor-edit-comment-dialog-title-when-editing = حرّر التعليق
+pdfjs-editor-edit-comment-dialog-save-button-when-editing = حدّث
+# No existing comment
+pdfjs-editor-edit-comment-dialog-title-when-adding = أضِف تعليقًا
+pdfjs-editor-edit-comment-dialog-save-button-when-adding = أضف
+pdfjs-editor-edit-comment-dialog-text-input =
+    .placeholder = ابدأ الكتابة…
+pdfjs-editor-edit-comment-dialog-cancel-button = ألغِ
+
+## Edit a comment button in the editor toolbar
+
+pdfjs-editor-add-comment-button =
+    .title = أضف التعليق
+
+## The view manager is a sidebar displaying different views:
+##  - thumbnails;
+##  - outline;
+##  - attachments;
+##  - layers.
+## The thumbnails view is used to edit the pdf: remove/insert pages, ...
+
+pdfjs-toggle-views-manager-button =
+    .title = بدّل ظهور الشريط الجانبي
+pdfjs-toggle-views-manager-button1-label = أدِر الصفحات
+pdfjs-toggle-views-manager-button-label = بدّل ظهور الشريط الجانبي
+pdfjs-views-manager-sidebar =
+    .aria-label = الشريط الجانبي
+pdfjs-views-manager-sidebar-resizer =
+    .aria-label = أداة تغيير حجم الشريط الجانبي
+pdfjs-views-manager-view-selector-button =
+    .title = المناظير
+pdfjs-views-manager-view-selector-button-label = المناظير
+pdfjs-views-manager-pages-title = الصفحات
+pdfjs-views-manager-outlines-title = مخطط المستند
+pdfjs-views-manager-attachments-title = المرفقات
+pdfjs-views-manager-layers-title = ‏‏الطبقات
+pdfjs-views-manager-pages-option-label = الصفحات
+pdfjs-views-manager-outlines-option-label = مخطط المستند
+pdfjs-views-manager-attachments-option-label = المرفقات
+pdfjs-views-manager-layers-option-label = ‏‏الطبقات
+pdfjs-views-manager-add-file-button =
+    .title = أضف ملف
+pdfjs-views-manager-add-file-button-label = أضف ملف
+pdfjs-views-manager-pages-status-none-action-label = حدّد الصفحات
+pdfjs-views-manager-pages-status-delete-button-label = احذف
+pdfjs-views-manager-status-warning-delete-label = تعذّر الحذف. حدِّث الصفحة وحاول مجددًا.
+
 ## Main menu for adding/removing signatures
 
 pdfjs-editor-delete-signature-button1 =
diff --git a/l10n/cs/viewer.ftl b/l10n/cs/viewer.ftl
index 69fed588b..e9d6aeada 100644
--- a/l10n/cs/viewer.ftl
+++ b/l10n/cs/viewer.ftl
@@ -680,6 +680,8 @@ pdfjs-views-manager-outlines-title1 = Osnova dokumentu
     .title = Osnova dokumentu (dvojité klepnutí rozbalí/sbalí všechny položky)
 pdfjs-views-manager-outlines-title = Osnova dokumentu
 pdfjs-views-manager-attachments-title = Přílohy
+pdfjs-views-manager-layers-title1 = Vrstvy
+    .title = Vrstvy (dvojité klepnutí obnoví všechny vrstvy do výchozího stavu)
 pdfjs-views-manager-layers-title = Vrstvy
 pdfjs-views-manager-pages-option-label = Stránky
 pdfjs-views-manager-outlines-option-label = Osnova dokumentu
diff --git a/l10n/cy/viewer.ftl b/l10n/cy/viewer.ftl
index c1677d5d4..183fff4ee 100644
--- a/l10n/cy/viewer.ftl
+++ b/l10n/cy/viewer.ftl
@@ -684,8 +684,12 @@ pdfjs-views-manager-view-selector-button =
     .title = Golygon
 pdfjs-views-manager-view-selector-button-label = Golygon
 pdfjs-views-manager-pages-title = Tudalennau
+pdfjs-views-manager-outlines-title1 = Amlinelliad Dogfen
+    .title = Amlinelliad dogfen (clic dwbl i ehangu/leihau pob eitem)
 pdfjs-views-manager-outlines-title = Amlinelliad dogfen
 pdfjs-views-manager-attachments-title = Atodiadau
+pdfjs-views-manager-layers-title1 = Haenau
+    .title = Haenau clic dwbl i ailosod pob haen i'r cyflwr ragosodedig)
 pdfjs-views-manager-layers-title = Haenau
 pdfjs-views-manager-pages-option-label = Tudalennau
 pdfjs-views-manager-outlines-option-label = Amlinelliad dogfen
@@ -710,6 +714,7 @@ pdfjs-views-manager-pages-status-action-button-label = Rheoli
 pdfjs-views-manager-pages-status-copy-button-label = Copïo
 pdfjs-views-manager-pages-status-cut-button-label = Torri
 pdfjs-views-manager-pages-status-delete-button-label = Dileu
+pdfjs-views-manager-pages-status-export-selected-button-label = Wedi dewis allforio…
 pdfjs-views-manager-pages-status-save-as-button-label = Cadw fel…
 # Variables:
 #   $count (Number) - the number of selected pages to be cut.
@@ -762,6 +767,9 @@ pdfjs-views-manager-paste-button-before =
 #   $page (Number) - the page number after which the paste button is.
 pdfjs-views-manager-paste-button-after =
     .title = Gludo ar ôl tudalen { $page }
+# Badge used to promote a new feature in the UI, keep it as short as possible.
+# It's spelled uppercase for English, but it can be translated as usual.
+pdfjs-new-badge-content = NEWYDD
 pdfjs-toggle-views-manager-button1 =
     .title = Rheoli tudalennau
 
diff --git a/l10n/ro/viewer.ftl b/l10n/ro/viewer.ftl
index 43a969d7e..d136aa05f 100644
--- a/l10n/ro/viewer.ftl
+++ b/l10n/ro/viewer.ftl
@@ -201,6 +201,19 @@ pdfjs-thumb-page-title =
 #   $page (Number) - the page number
 pdfjs-thumb-page-canvas =
     .aria-label = Miniatura paginii { $page }
+# Variables:
+#   $page (Number) - the page number
+pdfjs-thumb-page-checkbox1 =
+    .title = Selectează pagina { $page }
+# Variables:
+#   $page (Number) - the page number
+pdfjs-thumb-page-checkbox =
+    .aria-label = Selectează pagina { $page }
+# Variables:
+#   $page (Number) - the page number
+#   $total (Number) - the number of pages
+pdfjs-thumb-page-title1 =
+    .title = Pagina { $page } din { $total }
 
 ## Find panel button title and messages
 
@@ -648,15 +661,22 @@ pdfjs-toggle-views-manager-button =
     .title = Comută bara laterală
 pdfjs-toggle-views-manager-notification-button =
     .title = Comută bara laterală (documentul conține miniaturi/schițe/atașamente/straturi)
+pdfjs-toggle-views-manager-button1-label = Gestionează paginile
 pdfjs-toggle-views-manager-button-label = Comută bara laterală
 pdfjs-views-manager-sidebar =
     .aria-label = Bară laterală
+pdfjs-views-manager-sidebar-resizer =
+    .aria-label = Redimensionare bară laterală
 pdfjs-views-manager-view-selector-button =
     .title = Vizualizări
 pdfjs-views-manager-view-selector-button-label = Vizualizări
 pdfjs-views-manager-pages-title = Pagini
+pdfjs-views-manager-outlines-title1 = Structura documentului
+    .title = Structura documentului (dă dublu clic pentru extinderea/restrângerea elementelor)
 pdfjs-views-manager-outlines-title = Schiță document
 pdfjs-views-manager-attachments-title = Atașamente
+pdfjs-views-manager-layers-title1 = Straturi
+    .title = Straturi (dă dublu clic ca să resetezi toate straturile la starea implicită)
 pdfjs-views-manager-layers-title = Straturi
 pdfjs-views-manager-pages-option-label = Pagini
 pdfjs-views-manager-outlines-option-label = Schiță document
@@ -678,6 +698,7 @@ pdfjs-views-manager-pages-status-action-button-label = Gestionează
 pdfjs-views-manager-pages-status-copy-button-label = Copiază
 pdfjs-views-manager-pages-status-cut-button-label = Taie
 pdfjs-views-manager-pages-status-delete-button-label = Șterge
+pdfjs-views-manager-pages-status-export-selected-button-label = Exportă selecția…
 pdfjs-views-manager-pages-status-save-as-button-label = Salvează ca…
 # Variables:
 #   $count (Number) - the number of selected pages to be cut.
@@ -710,9 +731,22 @@ pdfjs-views-manager-status-warning-copy-label = Nu s-a putut copia. Reîmprospă
 pdfjs-views-manager-status-warning-delete-label = Nu s-a putut șterge. Reîmprospătează pagina și încearcă din nou.
 pdfjs-views-manager-status-warning-save-label = Nu s-a putut salva. Reîmprospătează pagina și încearcă din nou.
 pdfjs-views-manager-status-undo-button-label = Anulează
+pdfjs-views-manager-status-done-button-label = Terminat
 pdfjs-views-manager-status-close-button =
     .title = Închide
 pdfjs-views-manager-status-close-button-label = Închide
+pdfjs-views-manager-paste-button-label = Lipește
+pdfjs-views-manager-paste-button-before =
+    .title = Inserează înainte de prima pagină
+# Variables:
+#   $page (Number) - the page number after which the paste button is.
+pdfjs-views-manager-paste-button-after =
+    .title = Inserează după pagina { $page }
+# Badge used to promote a new feature in the UI, keep it as short as possible.
+# It's spelled uppercase for English, but it can be translated as usual.
+pdfjs-new-badge-content = NOU
+pdfjs-toggle-views-manager-button1 =
+    .title = Gestionează paginile
 
 ## Main menu for adding/removing signatures
 
diff --git a/l10n/sk/viewer.ftl b/l10n/sk/viewer.ftl
index 716630e9a..d8ff90537 100644
--- a/l10n/sk/viewer.ftl
+++ b/l10n/sk/viewer.ftl
@@ -676,8 +676,12 @@ pdfjs-views-manager-view-selector-button =
     .title = Zobrazenia
 pdfjs-views-manager-view-selector-button-label = Zobrazenia
 pdfjs-views-manager-pages-title = Strany
+pdfjs-views-manager-outlines-title1 = Prehľad dokumentu
+    .title = Prehľad dokumentu (dvojitým kliknutím rozbalíte/zbalíte všetky položky)
 pdfjs-views-manager-outlines-title = Prehľad dokumentu
 pdfjs-views-manager-attachments-title = Prílohy
+pdfjs-views-manager-layers-title1 = Vrstvy
+    .title = Vrstvy (dvojitým kliknutím obnovíte všetky vrstvy do predvoleného stavu)
 pdfjs-views-manager-layers-title = Vrstvy
 pdfjs-views-manager-pages-option-label = Strany
 pdfjs-views-manager-outlines-option-label = Prehľad dokumentu
@@ -700,6 +704,7 @@ pdfjs-views-manager-pages-status-action-button-label = Spravovať
 pdfjs-views-manager-pages-status-copy-button-label = Kopírovať
 pdfjs-views-manager-pages-status-cut-button-label = Vystrihnúť
 pdfjs-views-manager-pages-status-delete-button-label = Odstrániť
+pdfjs-views-manager-pages-status-export-selected-button-label = Exportovať vybrané…
 pdfjs-views-manager-pages-status-save-as-button-label = Uložiť ako…
 # Variables:
 #   $count (Number) - the number of selected pages to be cut.
@@ -746,6 +751,9 @@ pdfjs-views-manager-paste-button-before =
 #   $page (Number) - the page number after which the paste button is.
 pdfjs-views-manager-paste-button-after =
     .title = Vložiť za stranu { $page }
+# Badge used to promote a new feature in the UI, keep it as short as possible.
+# It's spelled uppercase for English, but it can be translated as usual.
+pdfjs-new-badge-content = NOVÉ
 pdfjs-toggle-views-manager-button1 =
     .title = Spravovať strany
 
diff --git a/l10n/zh-CN/viewer.ftl b/l10n/zh-CN/viewer.ftl
index a87b03ce9..75a38536e 100644
--- a/l10n/zh-CN/viewer.ftl
+++ b/l10n/zh-CN/viewer.ftl
@@ -209,6 +209,11 @@ pdfjs-thumb-page-checkbox1 =
 #   $page (Number) - the page number
 pdfjs-thumb-page-checkbox =
     .aria-label = 选择第 { $page } 页
+# Variables:
+#   $page (Number) - the page number
+#   $total (Number) - the number of pages
+pdfjs-thumb-page-title1 =
+    .title = 第 { $page } / { $total } 页
 
 ## Find panel button title and messages
 
@@ -641,6 +646,8 @@ pdfjs-toggle-views-manager-button1-label = 管理页面
 pdfjs-toggle-views-manager-button-label = 打开/关闭侧栏
 pdfjs-views-manager-sidebar =
     .aria-label = 侧栏
+pdfjs-views-manager-sidebar-resizer =
+    .aria-label = 调整侧栏大小
 pdfjs-views-manager-view-selector-button =
     .title = 视图
 pdfjs-views-manager-view-selector-button-label = 视图
@@ -667,6 +674,7 @@ pdfjs-views-manager-pages-status-action-button-label = 管理
 pdfjs-views-manager-pages-status-copy-button-label = 复制
 pdfjs-views-manager-pages-status-cut-button-label = 剪切
 pdfjs-views-manager-pages-status-delete-button-label = 删除
+pdfjs-views-manager-pages-status-export-selected-button-label = 导出选中的页面…
 pdfjs-views-manager-pages-status-save-as-button-label = 另存为…
 # Variables:
 #   $count (Number) - the number of selected pages to be cut.
@@ -684,12 +692,17 @@ pdfjs-views-manager-status-warning-copy-label = 无法复制，请刷新页面
 pdfjs-views-manager-status-warning-delete-label = 无法删除，请刷新页面并重试。
 pdfjs-views-manager-status-warning-save-label = 无法保存，请刷新页面并重试。
 pdfjs-views-manager-status-undo-button-label = 撤销
+pdfjs-views-manager-status-done-button-label = 完成
 pdfjs-views-manager-status-close-button =
     .title = 关闭
 pdfjs-views-manager-status-close-button-label = 关闭
 pdfjs-views-manager-paste-button-label = 粘贴
 pdfjs-views-manager-paste-button-before =
     .title = 粘贴在第一页之前
+# Variables:
+#   $page (Number) - the page number after which the paste button is.
+pdfjs-views-manager-paste-button-after =
+    .title = 粘贴在第 { $page } 页之后
 # Badge used to promote a new feature in the UI, keep it as short as possible.
 # It's spelled uppercase for English, but it can be translated as usual.
 pdfjs-new-badge-content = 新