Mel34

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE bindings>
<bindings xmlns="http://www.mozilla.org/xbl">
    <binding id="tabs-scroll" extends="chrome://global/content/bindings/scrollbox.xml#scrollbox">
        <handlers>
            <handler event="wheel"><![CDATA[
                // Preserve original behaviour if meta (Windows) key is held
                if (event.metaKey) return;
                                
                if (event.deltaY < 0) {