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diff --git a/testing/marionette/client/marionette_driver/localization.py b/testing/marionette/client/marionette_driver/localization.py
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+# 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/.
+
+
+class L10n(object):
+    """An API which allows Marionette to handle localized content.
+
+    The `localization`_ of UI elements in Gecko based applications is done via
+    entities and properties. For static values entities are used, which are located
+    in .dtd files. Whereby for dynamically updated content the values come from
+    .property files. Both types of elements can be identifed via a unique id,
+    and the translated content retrieved.
+
+    For example::
+
+        from marionette_driver.localization import L10n
+        l10n = L10n(marionette)
+
+        l10n.localize_entity(["chrome://branding/locale/brand.dtd"], "brandShortName")
+        l10n.localize_property(["chrome://global/locale/findbar.properties"], "FastFind"))
+
+    .. _localization: https://mzl.la/2eUMjyF
+    """
+
+    def __init__(self, marionette):
+        self._marionette = marionette
+
+    def localize_entity(self, dtd_urls, entity_id):
+        """Retrieve the localized string for the specified entity id.
+
+        :param dtd_urls: List of .dtd URLs which will be used to search for the entity.
+        :param entity_id: ID of the entity to retrieve the localized string for.
+
+        :returns: The localized string for the requested entity.
+        :raises: :exc:`NoSuchElementException`
+        """
+        body = {"urls": dtd_urls, "id": entity_id}
+        return self._marionette._send_message("L10n:LocalizeEntity", body, key="value")
+
+    def localize_property(self, properties_urls, property_id):
+        """Retrieve the localized string for the specified property id.
+
+        :param properties_urls: List of .properties URLs which will be used to
+                                search for the property.
+        :param property_id: ID of the property to retrieve the localized string for.
+
+        :returns: The localized string for the requested property.
+        :raises: :exc:`NoSuchElementException`
+        """
+        body = {"urls": properties_urls, "id": property_id}
+        return self._marionette._send_message(
+            "L10n:LocalizeProperty", body, key="value"
+        )