diff --git a/sway/config b/sway/config
index 100a3e6..58f20d0 100644
--- a/sway/config
+++ b/sway/config
@@ -22,6 +22,11 @@ bindsym $mod+Shift+apostrophe kill
 
 # start a program launcher
 bindsym $mod+d exec $menu
+
+# PORT: default browser is Firefox (see `xdg-settings get default-web-browser`).
+# --new-window opens a fresh window even if Firefox is already running.
+set $browser firefox
+bindsym $mod+b exec $browser --new-window
 # There also is the (new) i3-dmenu-desktop which only displays applications
 # shipping a .desktop file. It is a wrapper around dmenu, so you need that
 # installed.