Fix Bug 34795.

apps/common/main/lib/component/ComboBox.js

@@ -232,6 +232,7 @@ define([
                         minScrollbarLength: 40,
                         scrollYMarginOffset: 30,
                         includePadding: true,
+                        wheelSpeed: 10,
                         alwaysVisibleY: this.scrollAlwaysVisible
                     }, this.options.scroller));
                 }
@@ -256,6 +257,7 @@ define([
                         minScrollbarLength: 40,
                         scrollYMarginOffset: 30,
                         includePadding: true,
+                        wheelSpeed: 10,
                         alwaysVisibleY: this.scrollAlwaysVisible
                     }, this.options.scroller));
                 }
@@ -567,6 +569,7 @@ define([
                     minScrollbarLength : 40,
                     scrollYMarginOffset: 30,
                     includePadding     : true,
+                    wheelSpeed: 10,
                     alwaysVisibleY: this.scrollAlwaysVisible
                 }, this.options.scroller));
             }

apps/common/main/lib/component/ComboBoxFonts.js

@@ -87,6 +87,7 @@ define([
                 Common.UI.ComboBox.prototype.initialize.call(this, _.extend(options, {
                     displayField: 'name',
                     scroller: {
+                        wheelSpeed: 20,
                         alwaysVisibleY: true,
                         onChange: this.updateVisibleFontsTiles.bind(this)
                     }