diff --git a/.config/hypr/windows_rules.conf b/.config/hypr/windows_rules.conf
index edfb653..4b475dd 100644
--- a/.config/hypr/windows_rules.conf
+++ b/.config/hypr/windows_rules.conf
@@ -28,6 +28,10 @@ windowrulev2 = noblur,class:^(xwaylandvideobridge)$
 # ida window rule for tiling
 windowrule=tile,title:IDA v7
 
+# Thunderbird compose new mail is floating
+windowrulev2=float,class:(thunderbird),title:(Write.*)
+windowrulev2=size 1000 800,class:(thunderbird),title:(Write.*)
+
 # gdb pwntools window rule to open on the right
 #windowrule=tile,title:gdb-pwntools