diff --git a/lib/fusuma/plugin/appmatcher.rb b/lib/fusuma/plugin/appmatcher.rb
index ce3426d..da8e8a8 100644
--- a/lib/fusuma/plugin/appmatcher.rb
+++ b/lib/fusuma/plugin/appmatcher.rb
@@ -3,7 +3,6 @@
 require "fusuma/plugin/appmatcher/version"
 
 require "fusuma/plugin/appmatcher/x11"
-require "fusuma/plugin/appmatcher/gnome"
 require "fusuma/plugin/appmatcher/gnome_extension"
 require "fusuma/plugin/appmatcher/gnome_extensions/installer"
 require "fusuma/plugin/appmatcher/unsupported_backend"
diff --git a/lib/fusuma/plugin/appmatcher/gnome.rb b/lib/fusuma/plugin/appmatcher/gnome.rb
deleted file mode 100644
index 3772687..0000000
--- a/lib/fusuma/plugin/appmatcher/gnome.rb
+++ /dev/null
@@ -1,125 +0,0 @@
-# frozen_string_literal: true
-
-require "json"
-require "dbus"
-require_relative "user_switcher"
-
-module Fusuma
-  module Plugin
-    module Appmatcher
-      # Search Active Window's Name
-      class Gnome
-        include UserSwitcher
-
-        attr_reader :reader, :writer
-
-        def initialize
-          @reader, @writer = IO.pipe
-        end
-
-        # fork process and watch signal
-        # @return [Integer] Process id
-        def watch_start
-          as_user(proctitle: self.class.name.underscore) do |user|
-            @reader.close
-            ENV["DBUS_SESSION_BUS_ADDRESS"] = "unix:path=/run/user/#{user.uid}/bus"
-            register_on_application_changed(Matcher.new)
-          end
-        end
-
-        private
-
-        def register_on_application_changed(matcher)
-          matcher.on_active_application_changed do |name|
-            notify(name)
-          end
-        end
-
-        def notify(name)
-          @writer.puts(name)
-        rescue Errno::EPIPE
-          exit 0
-        rescue => e
-          MultiLogger.error e.message
-          exit 1
-        end
-
-        # Look up application name using dbus
-        class Matcher
-          def initialize
-            session_bus = DBus.session_bus
-            service = session_bus.service("org.gnome.Shell")
-            @interface = service["/org/gnome/Shell"]["org.gnome.Shell"]
-          rescue DBus::Error => e
-            MultiLogger.error "DBus::Error: #{e.message}"
-
-            exit 1
-          end
-
-          # @return [Array<Application>]
-          def running_applications
-            gnome_shell_eval(
-              <<~GJS
-                global.get_window_actors().map(a => a.get_meta_window().get_wm_class());
-              GJS
-            )
-          end
-
-          def active_application
-            # const index = global.get_window_actors()
-            #                   .findIndex(a=>a.meta_window.has_focus()===true);
-            # global.get_window_actors()[index].get_meta_window().get_wm_class();
-            gnome_shell_eval(
-              <<~GJS
-                const actor = global.get_window_actors().find(a=>a.meta_window.has_focus()===true)
-                actor && actor.get_meta_window().get_wm_class()
-              GJS
-            )
-          end
-
-          # TODO
-          # def window_title
-          # # const index = global.get_window_actors()
-          # #                   .findIndex(a=>a.meta_window.has_focus()===true);
-          # # global.get_window_actors()[index].get_meta_window().get_title();
-          #   gnome_shell_eval(
-          #     # <<~GJS
-          #     #   global.get_window_actors().map((current) => {
-          #     #     const wm_class = current.get_meta_window().get_wm_class();
-          #     #     const title = current.get_meta_window().get_title();
-          #     #     return { application: wm_class, window_title: title }
-          #     #   })
-          #     # GJS
-          #   )
-          # end
-
-          def gnome_shell_eval(string)
-            success, body = @interface.Eval(string)
-
-            if success
-              response = begin
-                JSON.parse(body)
-              rescue
-                nil
-              end
-              return response
-            end
-
-            raise body
-          end
-
-          def on_active_application_changed
-            loop do
-              sleep 0.5
-              new_application = active_application
-              next if @old_application == new_application
-
-              yield(new_application || "NOT FOUND") if block_given?
-              @old_application = new_application
-            end
-          end
-        end
-      end
-    end
-  end
-end
diff --git a/spec/fusuma/plugin/appmatcher/gnome_spec.rb b/spec/fusuma/plugin/appmatcher/gnome_spec.rb
deleted file mode 100644
index 644d59d..0000000
--- a/spec/fusuma/plugin/appmatcher/gnome_spec.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-# frozen_string_literal: true
-
-require "spec_helper"
-require "./lib/fusuma/plugin/appmatcher/gnome"
-
-module Fusuma
-  module Plugin
-    module Appmatcher
-      RSpec.describe Gnome do
-        it "requires ruby-dbus" do
-          expect(DBus).not_to be nil
-        end
-      end
-    end
-  end
-end