diff --git a/conf.d/window_rules.conf b/conf.d/window_rules.conf
index 0b468cc..4383604 100644
--- a/conf.d/window_rules.conf
+++ b/conf.d/window_rules.conf
@@ -7,3 +7,4 @@ for_window [class="gnome-calculator"] floating enable
 for_window [urgent="latest" class="firefox" workspace=$ws1] focus ; workspace number $ws1
 for_window [class="pycharm"] workspace number $ws4
 for_window [urgent=latest] focus
+for_window [class="firefox"] border pixel 0