diff --git a/Userland/DevTools/GMLPlayground/MainWidget.cpp b/Userland/DevTools/GMLPlayground/MainWidget.cpp
index b96d99f8f34..02e854e6565 100644
--- a/Userland/DevTools/GMLPlayground/MainWidget.cpp
+++ b/Userland/DevTools/GMLPlayground/MainWidget.cpp
@@ -90,7 +90,7 @@ ErrorOr<NonnullRefPtr<MainWidget>> MainWidget::try_create(GUI::Icon const& icon)
     main_widget->m_editor->on_change = [main_widget = main_widget.ptr()] {
         main_widget->m_preview->remove_all_children();
         // FIXME: Parsing errors happen while the user is typing. What should we do about them?
-        (void)main_widget->m_preview->load_from_gml(main_widget->m_editor->text(), [](DeprecatedString const& class_name) -> ErrorOr<NonnullRefPtr<Core::EventReceiver>> {
+        (void)main_widget->m_preview->load_from_gml(main_widget->m_editor->text(), [](StringView class_name) -> ErrorOr<NonnullRefPtr<Core::EventReceiver>> {
             return UnregisteredWidget::try_create(class_name);
         });
     };
diff --git a/Userland/DevTools/HackStudio/GMLPreviewWidget.cpp b/Userland/DevTools/HackStudio/GMLPreviewWidget.cpp
index 54ab83cd21b..0628e49dcb1 100644
--- a/Userland/DevTools/HackStudio/GMLPreviewWidget.cpp
+++ b/Userland/DevTools/HackStudio/GMLPreviewWidget.cpp
@@ -28,7 +28,7 @@ void GMLPreviewWidget::load_gml(DeprecatedString const& gml)
     }
 
     // FIXME: Parsing errors happen while the user is typing. What should we do about them?
-    (void)load_from_gml(gml, [](DeprecatedString const& name) -> ErrorOr<NonnullRefPtr<Core::EventReceiver>> {
+    (void)load_from_gml(gml, [](StringView name) -> ErrorOr<NonnullRefPtr<Core::EventReceiver>> {
         return GUI::Label::try_create(TRY(String::formatted("{} is not registered as a GML element!", name)));
     });
 
diff --git a/Userland/Libraries/LibGUI/Widget.cpp b/Userland/Libraries/LibGUI/Widget.cpp
index 418049b73c0..961eb6f004e 100644
--- a/Userland/Libraries/LibGUI/Widget.cpp
+++ b/Userland/Libraries/LibGUI/Widget.cpp
@@ -57,7 +57,7 @@ Widget::Widget()
     REGISTER_BOOL_PROPERTY("visible", is_visible, set_visible);
     REGISTER_BOOL_PROPERTY("focused", is_focused, set_focus);
     REGISTER_BOOL_PROPERTY("enabled", is_enabled, set_enabled);
-    REGISTER_DEPRECATED_STRING_PROPERTY("tooltip", tooltip_deprecated, set_tooltip_deprecated);
+    REGISTER_STRING_PROPERTY("tooltip", tooltip, set_tooltip);
 
     REGISTER_UI_SIZE_PROPERTY("min_size", min_size, set_min_size);
     REGISTER_READONLY_UI_SIZE_PROPERTY("effective_min_size", effective_min_size);
@@ -82,7 +82,7 @@ Widget::Widget()
     REGISTER_INT_PROPERTY("x", x, set_x);
     REGISTER_INT_PROPERTY("y", y, set_y);
 
-    REGISTER_DEPRECATED_STRING_PROPERTY("font", m_font->family, set_font_family);
+    REGISTER_STRING_PROPERTY("font", font_family, set_font_family);
     REGISTER_INT_PROPERTY("font_size", m_font->presentation_size, set_font_size);
     REGISTER_FONT_WEIGHT_PROPERTY("font_weight", m_font->weight, set_font_weight);
 
@@ -819,9 +819,9 @@ void Widget::set_font(Gfx::Font const* font)
     update();
 }
 
-void Widget::set_font_family(DeprecatedString const& family)
+void Widget::set_font_family(String const& family)
 {
-    set_font(Gfx::FontDatabase::the().get(family, m_font->presentation_size(), m_font->weight(), m_font->width(), m_font->slope()));
+    set_font(Gfx::FontDatabase::the().get(family.to_deprecated_string(), m_font->presentation_size(), m_font->weight(), m_font->width(), m_font->slope()));
 }
 
 void Widget::set_font_size(unsigned size)
@@ -1108,6 +1108,11 @@ Gfx::IntRect Widget::relative_non_grabbable_rect() const
 }
 
 void Widget::set_tooltip_deprecated(DeprecatedString tooltip)
+{
+    set_tooltip(String::from_deprecated_string(move(tooltip)).release_value_but_fixme_should_propagate_errors());
+}
+
+void Widget::set_tooltip(String tooltip)
 {
     m_tooltip = move(tooltip);
     if (Application::the()->tooltip_source_widget() == this)
@@ -1117,7 +1122,7 @@ void Widget::set_tooltip_deprecated(DeprecatedString tooltip)
 void Widget::show_or_hide_tooltip()
 {
     if (has_tooltip())
-        Application::the()->show_tooltip(m_tooltip, this);
+        Application::the()->show_tooltip(m_tooltip.to_deprecated_string(), this);
     else
         Application::the()->hide_tooltip();
 }
@@ -1140,7 +1145,7 @@ void Widget::set_override_cursor(AK::Variant<Gfx::StandardCursor, NonnullRefPtr<
 
 ErrorOr<void> Widget::load_from_gml(StringView gml_string)
 {
-    return load_from_gml(gml_string, [](DeprecatedString const& class_name) -> ErrorOr<NonnullRefPtr<Core::EventReceiver>> {
+    return load_from_gml(gml_string, [](StringView class_name) -> ErrorOr<NonnullRefPtr<Core::EventReceiver>> {
         dbgln("Class '{}' not registered", class_name);
         return Error::from_string_literal("Class not registered");
     });
@@ -1265,4 +1270,9 @@ void Widget::add_spacer()
     return layout()->add_spacer();
 }
 
+String Widget::font_family() const
+{
+    return String::from_deprecated_string(m_font->family()).release_value_but_fixme_should_propagate_errors();
+}
+
 }
diff --git a/Userland/Libraries/LibGUI/Widget.h b/Userland/Libraries/LibGUI/Widget.h
index 3da9809f814..0b0b5ece2db 100644
--- a/Userland/Libraries/LibGUI/Widget.h
+++ b/Userland/Libraries/LibGUI/Widget.h
@@ -161,7 +161,9 @@ public:
     virtual bool is_visible_for_timer_purposes() const override;
 
     bool has_tooltip() const { return !m_tooltip.is_empty(); }
-    DeprecatedString tooltip_deprecated() const { return m_tooltip; }
+    String tooltip() const { return m_tooltip; }
+    void set_tooltip(String tooltip);
+    DeprecatedString tooltip_deprecated() const { return tooltip().to_deprecated_string(); }
     void set_tooltip_deprecated(DeprecatedString);
 
     bool is_auto_focusable() const { return m_auto_focusable; }
@@ -283,7 +285,7 @@ public:
     void set_font(Gfx::Font const*);
     void set_font(Gfx::Font const& font) { set_font(&font); }
 
-    void set_font_family(DeprecatedString const&);
+    void set_font_family(String const&);
     void set_font_size(unsigned);
     void set_font_weight(unsigned);
     void set_font_fixed_width(bool);
@@ -343,7 +345,7 @@ public:
     AK::Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap const>> const& override_cursor() const { return m_override_cursor; }
     void set_override_cursor(AK::Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap const>>);
 
-    using UnregisteredChildHandler = ErrorOr<NonnullRefPtr<Core::EventReceiver>>(DeprecatedString const&);
+    using UnregisteredChildHandler = ErrorOr<NonnullRefPtr<Core::EventReceiver>>(StringView);
     ErrorOr<void> load_from_gml(StringView);
     ErrorOr<void> load_from_gml(StringView, UnregisteredChildHandler);
 
@@ -421,6 +423,9 @@ private:
     int dummy_fixed_height() { return 0; }
     Gfx::IntSize dummy_fixed_size() { return {}; }
 
+    // HACK: Used as property getter for the font_family property, can be removed when Font is migrated from DeprecatedString.
+    String font_family() const;
+
     Window* m_window { nullptr };
     RefPtr<Layout> m_layout;
 
@@ -428,7 +433,7 @@ private:
     Gfx::ColorRole m_background_role;
     Gfx::ColorRole m_foreground_role;
     NonnullRefPtr<Gfx::Font const> m_font;
-    DeprecatedString m_tooltip;
+    String m_tooltip;
 
     UISize m_min_size { SpecialDimension::Shrink };
     UISize m_max_size { SpecialDimension::Grow };