diff --git a/simple/init.lua b/simple/init.lua
index f6debfe..12ca733 100644
--- a/simple/init.lua
+++ b/simple/init.lua
@@ -616,7 +616,11 @@ awful.rules.rules = {
             role = {
                 "AlarmWindow", -- Thunderbird's calendar.
                 "ConfigManager", -- Thunderbird's about:config.
-                "pop-up", -- e.g. Google Chrome's (detached) Developer Tools.
+                "pop-up",
+            },
+            type = {
+                "dialog",
+                "floating",
             }
         },
         properties = { floating = true }