add: #elifdef XP_UNIX if (!event.altKey) 
context: function ctrlNumberTabSelection(event){  if (event.altKey && event.keyCode == KeyEvent.DOM_VK_RETURN) {    // Don't let winxp beep on ALT+ENTER, since the URL bar uses it.    event.preventDefault();    return;  } #ifdef XP_MACOSX  if (!event.metaKey)#else  if (!event.ctrlKey)#endif    return;  var index = event.charCode - 49;  if (index < 0 || index > 8)    return;  if (index >= gBrowser.tabContainer.childNodes.length)    return;  var oldTab = gBrowser.selectedTab;  var newTab = gBrowser.tabContainer.childNodes[index];  if (newTab != oldTab) {    oldTab.selected = false;    gBrowser.selectedTab = newTab;  }  event.preventDefault();  event.preventBubble();  event.preventCapture();  event.stopPropagation();}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/59285c07c8189986080dff522147550d022a52e5/browser.js/clean/browser/base/content/browser.js