diff --git a/tree/.config/fish/config.fish.tpl b/tree/.config/fish/config.fish.tpl
index b12473b..86cd6bc 100644
--- a/tree/.config/fish/config.fish.tpl
+++ b/tree/.config/fish/config.fish.tpl
@@ -11,6 +11,9 @@ set -x QT_STYLE_OVERRIDE Oxygen
 
 {% if hostname == "buran" %}
 set -x QT_QPA_PLATFORMTHEME qt5ct
+
+# enable custom file picker in e.g. firefox
+set -x GTK_USE_PORTAL 1
 {% end %}
 
 {% if username == "u0_a213" %}