diff --git a/config.h b/config.h
index 221cd6a..ea57016 100644
--- a/config.h
+++ b/config.h
@@ -32,9 +32,7 @@ static const Rule rules[] = {
 	 *	WM_NAME(STRING) = title
 	 */
     /* class      instance    title       tags mask     isfloating   isterminal noswallow monitor */
-
     {"Virt-viewer", NULL, NULL, 1 << 8, 0, 0, 0, -1},
-    {"Firefox", "Toolkit", "Picture-in-Picture", (1 << 9) - 1, 0, 0, 0, -1},
     {"st", NULL, NULL, 0, 0, 1, 1, -1},
     {"Xephyr", NULL, NULL, 0, 1, 0, 0, -1},
     {"Xnest", NULL, NULL, 0, 1, 0, 0, -1},