diff --git a/Userland/Libraries/LibCore/MimeData.cpp b/Userland/Libraries/LibCore/MimeData.cpp
index b296ffa32e..0dcccf426a 100644
--- a/Userland/Libraries/LibCore/MimeData.cpp
+++ b/Userland/Libraries/LibCore/MimeData.cpp
@@ -11,15 +11,6 @@
 
 namespace Core {
 
-Vector<DeprecatedString> MimeData::formats() const
-{
-    Vector<DeprecatedString> mime_types;
-    mime_types.ensure_capacity(m_data.size());
-    for (auto& it : m_data)
-        mime_types.unchecked_append(it.key.to_deprecated_string());
-    return mime_types;
-}
-
 Vector<URL> MimeData::urls() const
 {
     auto it = m_data.find("text/uri-list"sv);
diff --git a/Userland/Libraries/LibCore/MimeData.h b/Userland/Libraries/LibCore/MimeData.h
index 36c190002b..64b24df853 100644
--- a/Userland/Libraries/LibCore/MimeData.h
+++ b/Userland/Libraries/LibCore/MimeData.h
@@ -24,7 +24,7 @@ public:
     void set_data(String const& mime_type, ByteBuffer&& data) { m_data.set(mime_type, move(data)); }
 
     bool has_format(StringView mime_type) const { return m_data.contains(mime_type); }
-    Vector<DeprecatedString> formats() const;
+    Vector<String> formats() const { return m_data.keys(); }
 
     // Convenience helpers for "text/plain"
     bool has_text() const { return has_format("text/plain"sv); }
diff --git a/Userland/Libraries/LibGUI/Application.cpp b/Userland/Libraries/LibGUI/Application.cpp
index ada928fa6c..decb52d7dc 100644
--- a/Userland/Libraries/LibGUI/Application.cpp
+++ b/Userland/Libraries/LibGUI/Application.cpp
@@ -283,7 +283,7 @@ void Application::set_pending_drop_widget(Widget* widget)
         m_pending_drop_widget->update();
 }
 
-void Application::set_drag_hovered_widget_impl(Widget* widget, Gfx::IntPoint position, Vector<DeprecatedString> mime_types)
+void Application::set_drag_hovered_widget_impl(Widget* widget, Gfx::IntPoint position, Vector<String> mime_types)
 {
     if (widget == m_drag_hovered_widget)
         return;
diff --git a/Userland/Libraries/LibGUI/Application.h b/Userland/Libraries/LibGUI/Application.h
index 2bf5b40ae6..dd3ca40451 100644
--- a/Userland/Libraries/LibGUI/Application.h
+++ b/Userland/Libraries/LibGUI/Application.h
@@ -78,7 +78,7 @@ public:
     Widget* pending_drop_widget() { return m_pending_drop_widget.ptr(); }
     Widget const* pending_drop_widget() const { return m_pending_drop_widget.ptr(); }
 
-    void set_drag_hovered_widget(Badge<Window>, Widget* widget, Gfx::IntPoint position = {}, Vector<DeprecatedString> mime_types = {})
+    void set_drag_hovered_widget(Badge<Window>, Widget* widget, Gfx::IntPoint position = {}, Vector<String> mime_types = {})
     {
         set_drag_hovered_widget_impl(widget, position, move(mime_types));
     }
@@ -106,7 +106,7 @@ private:
     void request_tooltip_show();
     void tooltip_hide_timer_did_fire();
 
-    void set_drag_hovered_widget_impl(Widget*, Gfx::IntPoint = {}, Vector<DeprecatedString> = {});
+    void set_drag_hovered_widget_impl(Widget*, Gfx::IntPoint = {}, Vector<String> = {});
     void set_pending_drop_widget(Widget*);
 
     OwnPtr<Core::EventLoop> m_event_loop;
diff --git a/Userland/Libraries/LibGUI/ConnectionToWindowServer.cpp b/Userland/Libraries/LibGUI/ConnectionToWindowServer.cpp
index 601184ccb4..3d9dd27f0e 100644
--- a/Userland/Libraries/LibGUI/ConnectionToWindowServer.cpp
+++ b/Userland/Libraries/LibGUI/ConnectionToWindowServer.cpp
@@ -259,7 +259,7 @@ void ConnectionToWindowServer::mouse_up(i32 window_id, Gfx::IntPoint mouse_posit
         Core::EventLoop::current().post_event(*window, make<MouseEvent>(Event::MouseUp, mouse_position, buttons, to_mouse_button(button), modifiers, wheel_delta_x, wheel_delta_y, wheel_raw_delta_x, wheel_raw_delta_y));
 }
 
-void ConnectionToWindowServer::mouse_move(i32 window_id, Gfx::IntPoint mouse_position, u32 button, u32 buttons, u32 modifiers, i32 wheel_delta_x, i32 wheel_delta_y, i32 wheel_raw_delta_x, i32 wheel_raw_delta_y, bool is_drag, Vector<DeprecatedString> const& mime_types)
+void ConnectionToWindowServer::mouse_move(i32 window_id, Gfx::IntPoint mouse_position, u32 button, u32 buttons, u32 modifiers, i32 wheel_delta_x, i32 wheel_delta_y, i32 wheel_raw_delta_x, i32 wheel_raw_delta_y, bool is_drag, Vector<String> const& mime_types)
 {
     if (auto* window = Window::from_window_id(window_id)) {
         if (is_drag)
diff --git a/Userland/Libraries/LibGUI/ConnectionToWindowServer.h b/Userland/Libraries/LibGUI/ConnectionToWindowServer.h
index b5930a95b7..13283cbcbc 100644
--- a/Userland/Libraries/LibGUI/ConnectionToWindowServer.h
+++ b/Userland/Libraries/LibGUI/ConnectionToWindowServer.h
@@ -26,7 +26,7 @@ private:
 
     virtual void fast_greet(Vector<Gfx::IntRect> const&, u32, u32, u32, Core::AnonymousBuffer const&, DeprecatedString const&, DeprecatedString const&, DeprecatedString const&, Vector<bool> const&, i32) override;
     virtual void paint(i32, Gfx::IntSize, Vector<Gfx::IntRect> const&) override;
-    virtual void mouse_move(i32, Gfx::IntPoint, u32, u32, u32, i32, i32, i32, i32, bool, Vector<DeprecatedString> const&) override;
+    virtual void mouse_move(i32, Gfx::IntPoint, u32, u32, u32, i32, i32, i32, i32, bool, Vector<String> const&) override;
     virtual void mouse_down(i32, Gfx::IntPoint, u32, u32, u32, i32, i32, i32, i32) override;
     virtual void mouse_double_click(i32, Gfx::IntPoint, u32, u32, u32, i32, i32, i32, i32) override;
     virtual void mouse_up(i32, Gfx::IntPoint, u32, u32, u32, i32, i32, i32, i32) override;
diff --git a/Userland/Libraries/LibGUI/Event.h b/Userland/Libraries/LibGUI/Event.h
index 1902889a06..82195b9d50 100644
--- a/Userland/Libraries/LibGUI/Event.h
+++ b/Userland/Libraries/LibGUI/Event.h
@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <AK/String.h>
 #include <AK/StringBuilder.h>
 #include <AK/Vector.h>
 #include <Kernel/API/KeyCode.h>
@@ -460,7 +461,7 @@ private:
 
 class DragEvent final : public Event {
 public:
-    DragEvent(Type type, Gfx::IntPoint position, Vector<DeprecatedString> mime_types)
+    DragEvent(Type type, Gfx::IntPoint position, Vector<String> mime_types)
         : Event(type)
         , m_position(position)
         , m_mime_types(move(mime_types))
@@ -468,11 +469,11 @@ public:
     }
 
     Gfx::IntPoint position() const { return m_position; }
-    Vector<DeprecatedString> const& mime_types() const { return m_mime_types; }
+    Vector<String> const& mime_types() const { return m_mime_types; }
 
 private:
     Gfx::IntPoint m_position;
-    Vector<DeprecatedString> m_mime_types;
+    Vector<String> m_mime_types;
 };
 
 class DropEvent final : public Event {
diff --git a/Userland/Libraries/LibGUI/FileSystemModel.cpp b/Userland/Libraries/LibGUI/FileSystemModel.cpp
index 252015e3be..3fff552d49 100644
--- a/Userland/Libraries/LibGUI/FileSystemModel.cpp
+++ b/Userland/Libraries/LibGUI/FileSystemModel.cpp
@@ -787,7 +787,7 @@ ErrorOr<String> FileSystemModel::column_name(int column) const
     VERIFY_NOT_REACHED();
 }
 
-bool FileSystemModel::accepts_drag(ModelIndex const& index, Vector<DeprecatedString> const& mime_types) const
+bool FileSystemModel::accepts_drag(ModelIndex const& index, Vector<String> const& mime_types) const
 {
     if (!mime_types.contains_slow("text/uri-list"sv))
         return false;
diff --git a/Userland/Libraries/LibGUI/FileSystemModel.h b/Userland/Libraries/LibGUI/FileSystemModel.h
index fa9535ac51..dccccab5c6 100644
--- a/Userland/Libraries/LibGUI/FileSystemModel.h
+++ b/Userland/Libraries/LibGUI/FileSystemModel.h
@@ -132,7 +132,7 @@ public:
     virtual ModelIndex parent_index(ModelIndex const&) const override;
     virtual ModelIndex index(int row, int column = 0, ModelIndex const& parent = ModelIndex()) const override;
     virtual StringView drag_data_type() const override { return "text/uri-list"sv; }
-    virtual bool accepts_drag(ModelIndex const&, Vector<DeprecatedString> const& mime_types) const override;
+    virtual bool accepts_drag(ModelIndex const&, Vector<String> const& mime_types) const override;
     virtual bool is_column_sortable(int column_index) const override { return column_index != Column::Icon; }
     virtual bool is_editable(ModelIndex const&) const override;
     virtual bool is_searchable() const override { return true; }
diff --git a/Userland/Libraries/LibGUI/Model.cpp b/Userland/Libraries/LibGUI/Model.cpp
index fa31bc91d1..f37904c5c1 100644
--- a/Userland/Libraries/LibGUI/Model.cpp
+++ b/Userland/Libraries/LibGUI/Model.cpp
@@ -63,7 +63,7 @@ ModelIndex Model::index(int row, int column, ModelIndex const&) const
     return create_index(row, column);
 }
 
-bool Model::accepts_drag(ModelIndex const&, Vector<DeprecatedString> const&) const
+bool Model::accepts_drag(ModelIndex const&, Vector<String> const&) const
 {
     return false;
 }
diff --git a/Userland/Libraries/LibGUI/Model.h b/Userland/Libraries/LibGUI/Model.h
index a2f038e74c..f9477a3a43 100644
--- a/Userland/Libraries/LibGUI/Model.h
+++ b/Userland/Libraries/LibGUI/Model.h
@@ -81,7 +81,7 @@ public:
     virtual bool is_searchable() const { return false; }
     virtual void set_data(ModelIndex const&, Variant const&) { }
     virtual int tree_column() const { return 0; }
-    virtual bool accepts_drag(ModelIndex const&, Vector<DeprecatedString> const& mime_types) const;
+    virtual bool accepts_drag(ModelIndex const&, Vector<String> const& mime_types) const;
     virtual Vector<ModelIndex> matches(StringView, unsigned = MatchesFlag::AllMatching, ModelIndex const& = ModelIndex()) { return {}; }
 
     virtual bool is_column_sortable([[maybe_unused]] int column_index) const { return true; }
diff --git a/Userland/Libraries/LibGUI/SortingProxyModel.cpp b/Userland/Libraries/LibGUI/SortingProxyModel.cpp
index 6357a16552..cd6c48d835 100644
--- a/Userland/Libraries/LibGUI/SortingProxyModel.cpp
+++ b/Userland/Libraries/LibGUI/SortingProxyModel.cpp
@@ -49,7 +49,7 @@ void SortingProxyModel::model_did_update(unsigned flags)
     update_sort(flags);
 }
 
-bool SortingProxyModel::accepts_drag(ModelIndex const& proxy_index, Vector<DeprecatedString> const& mime_types) const
+bool SortingProxyModel::accepts_drag(ModelIndex const& proxy_index, Vector<String> const& mime_types) const
 {
     return source().accepts_drag(map_to_source(proxy_index), mime_types);
 }
diff --git a/Userland/Libraries/LibGUI/SortingProxyModel.h b/Userland/Libraries/LibGUI/SortingProxyModel.h
index 84a3a35b9f..82eec947bb 100644
--- a/Userland/Libraries/LibGUI/SortingProxyModel.h
+++ b/Userland/Libraries/LibGUI/SortingProxyModel.h
@@ -34,7 +34,7 @@ public:
     virtual bool is_searchable() const override;
     virtual void set_data(ModelIndex const&, Variant const&) override;
     virtual Vector<ModelIndex> matches(StringView, unsigned = MatchesFlag::AllMatching, ModelIndex const& = ModelIndex()) override;
-    virtual bool accepts_drag(ModelIndex const&, Vector<DeprecatedString> const& mime_types) const override;
+    virtual bool accepts_drag(ModelIndex const&, Vector<String> const& mime_types) const override;
 
     virtual bool is_column_sortable(int column_index) const override;
 
diff --git a/Userland/Services/WindowServer/Event.h b/Userland/Services/WindowServer/Event.h
index add4160076..b736dea293 100644
--- a/Userland/Services/WindowServer/Event.h
+++ b/Userland/Services/WindowServer/Event.h
@@ -114,7 +114,7 @@ public:
     int wheel_raw_delta_y() const { return m_wheel_raw_delta_y; }
     bool is_drag() const { return m_drag; }
 
-    Vector<DeprecatedString> mime_types() const
+    Vector<String> mime_types() const
     {
         if (!m_mime_data)
             return {};
diff --git a/Userland/Services/WindowServer/WindowClient.ipc b/Userland/Services/WindowServer/WindowClient.ipc
index 225248f679..aca0b8a7d7 100644
--- a/Userland/Services/WindowServer/WindowClient.ipc
+++ b/Userland/Services/WindowServer/WindowClient.ipc
@@ -6,7 +6,7 @@ endpoint WindowClient
     fast_greet(Vector<Gfx::IntRect> screen_rects, u32 main_screen_index, u32 workspace_rows, u32 workspace_columns, Core::AnonymousBuffer theme_buffer, DeprecatedString default_font_query, DeprecatedString fixed_width_font_query, DeprecatedString window_title_font_query, Vector<bool> effects, i32 client_id) =|
 
     paint(i32 window_id, Gfx::IntSize window_size, Vector<Gfx::IntRect> rects) =|
-    mouse_move(i32 window_id, Gfx::IntPoint mouse_position, u32 button, u32 buttons, u32 modifiers, i32 wheel_delta_x, i32 wheel_delta_y, i32 wheel_raw_delta_x, i32 wheel_raw_delta_y, bool is_drag, Vector<DeprecatedString> mime_types) =|
+    mouse_move(i32 window_id, Gfx::IntPoint mouse_position, u32 button, u32 buttons, u32 modifiers, i32 wheel_delta_x, i32 wheel_delta_y, i32 wheel_raw_delta_x, i32 wheel_raw_delta_y, bool is_drag, Vector<String> mime_types) =|
     mouse_down(i32 window_id, Gfx::IntPoint mouse_position, u32 button, u32 buttons, u32 modifiers, i32 wheel_delta_x, i32 wheel_delta_y, i32 wheel_raw_delta_x, i32 wheel_raw_delta_y) =|
     mouse_double_click(i32 window_id, Gfx::IntPoint mouse_position, u32 button, u32 buttons, u32 modifiers, i32 wheel_delta_x, i32 wheel_delta_y, i32 wheel_raw_delta_x, i32 wheel_raw_delta_y) =|
     mouse_up(i32 window_id, Gfx::IntPoint mouse_position, u32 button, u32 buttons, u32 modifiers, i32 wheel_delta_x, i32 wheel_delta_y, i32 wheel_raw_delta_x, i32 wheel_raw_delta_y) =|