diff --git a/extensions/colorful-tabs.c b/extensions/colorful-tabs.c
index f0006396..01a0bd7b 100644
--- a/extensions/colorful-tabs.c
+++ b/extensions/colorful-tabs.c
@@ -79,6 +79,8 @@ colorful_tabs_deactivate_cb (MidoriExtension* extension,
 
     g_signal_handlers_disconnect_by_func (
         app, colorful_tabs_app_add_browser_cb, extension);
+    g_signal_handlers_disconnect_by_func (
+        browser, colorful_tabs_browser_add_tab_cb, extension);
     g_signal_handlers_disconnect_by_func (
         extension, colorful_tabs_deactivate_cb, browser);
     i = 0;