--- mozilla/browser/app/profile/firefox.js.mousewheel	2006-08-24 15:20:47.000000000 +0200
+++ mozilla/browser/app/profile/firefox.js	2006-08-24 15:22:15.000000000 +0200
@@ -336,6 +336,11 @@
 pref("mousewheel.withaltkey.action",0);
 pref("mousewheel.withaltkey.sysnumlines",false);
 
+// enable horizontal scroll with some horizontal mousewheel
+pref("mousewheel.horizscroll.withnokey.action",0);
+pref("mousewheel.horizscroll.withnokey.numlines",-1);
+pref("mousewheel.horizscroll.withnokey.sysnumlines",true);
+
 pref("profile.allow_automigration", false);   // setting to false bypasses automigration in the profile code
 
 // Customizable toolbar stuff