diff --git a/.environment.d/firefox.env b/.environment.d/firefox.env
new file mode 100644
index 0000000..35a1eea
--- /dev/null
+++ b/.environment.d/firefox.env
@@ -0,0 +1,7 @@
+# Fixes scrolling bug for G502 mice, where the first scroll step after a
+# direction change is not registered sometimes. Also enables gestures and
+# pixel-perfect trackpad scrolling apperantly:
+# https://wiki.archlinux.org/title/Firefox#Touchscreen_gestures_and_pixel-perfect_trackpad_scrolling
+if [ "$XDG_SESSION_TYPE" == "x11" ]; then
+    MOZ_USE_XINPUT2=1
+fi