diff --git a/locales/en-US/browser/browser/preferences/zen-preferences.ftl b/locales/en-US/browser/browser/preferences/zen-preferences.ftl
index d2e2c7589..ea49e2517 100644
--- a/locales/en-US/browser/browser/preferences/zen-preferences.ftl
+++ b/locales/en-US/browser/browser/preferences/zen-preferences.ftl
@@ -1,3 +1,6 @@
+# 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/.
 
 pane-zen-looks-title = Look and Feel
 category-zen-looks =
diff --git a/locales/en-US/browser/browser/zen-folders.ftl b/locales/en-US/browser/browser/zen-folders.ftl
index 6cd7d72cf..ebeeaf33c 100644
--- a/locales/en-US/browser/browser/zen-folders.ftl
+++ b/locales/en-US/browser/browser/zen-folders.ftl
@@ -1,3 +1,6 @@
+# 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/.
 
 zen-folders-search-placeholder =
     .placeholder = Search { $folder-name }...
diff --git a/locales/en-US/browser/browser/zen-general.ftl b/locales/en-US/browser/browser/zen-general.ftl
index 0b2f5641d..49fe38cf0 100644
--- a/locales/en-US/browser/browser/zen-general.ftl
+++ b/locales/en-US/browser/browser/zen-general.ftl
@@ -1,3 +1,6 @@
+# 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/.
 
 zen-panel-ui-current-profile-text = current profile
 
diff --git a/locales/en-US/browser/browser/zen-split-view.ftl b/locales/en-US/browser/browser/zen-split-view.ftl
index 0319f26d0..2f1bafedc 100644
--- a/locales/en-US/browser/browser/zen-split-view.ftl
+++ b/locales/en-US/browser/browser/zen-split-view.ftl
@@ -1,3 +1,6 @@
+# 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/.
 
 tab-zen-split-tabs =
     .label =
diff --git a/locales/en-US/browser/browser/zen-vertical-tabs.ftl b/locales/en-US/browser/browser/zen-vertical-tabs.ftl
index 1a40fa77a..cc9791f7f 100644
--- a/locales/en-US/browser/browser/zen-vertical-tabs.ftl
+++ b/locales/en-US/browser/browser/zen-vertical-tabs.ftl
@@ -1,3 +1,6 @@
+# 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/.
 
 zen-toolbar-context-tabs-right =
     .label = Tabs on the right
diff --git a/locales/en-US/browser/browser/zen-workspaces.ftl b/locales/en-US/browser/browser/zen-workspaces.ftl
index db5bf6574..67f43f7fe 100644
--- a/locales/en-US/browser/browser/zen-workspaces.ftl
+++ b/locales/en-US/browser/browser/zen-workspaces.ftl
@@ -1,3 +1,6 @@
+# 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/.
 
 zen-panel-ui-workspaces-text = Spaces
 
@@ -74,9 +77,9 @@ zen-workspace-creation-label = Spaces are used to organize your tabs and session
 zen-workspaces-delete-workspace-title = Delete Space?
 zen-workspaces-delete-workspace-body = Are you sure you want to delete { $name }? This action cannot be undone.
 
-# Note that the html tag MUST not be changed or removed, as it is used to better
-# display the shortcut in the toast notification.
+# Note that the html tag MUST not be changed or removed, as it is used to better
+# display the shortcut in the toast notification.
 zen-workspaces-close-all-unpinned-tabs-toast = Tabs Closed! Use <span>{ $shortcut }</span> to undo.
-zen-workspaces-close-all-unpinned-tabs-title = 
+zen-workspaces-close-all-unpinned-tabs-title =
     .label = Clear
     .tooltiptext = Close all unpinned tabs