Why have the left and right tab scroll buttons seemingly been removed in the latest version?
I've just installed the latest version of Firefox (19.0) and have discovered that the left and right tab scroll buttons (as illustrated here: http://support.mozilla.org/en-US/kb/scroll-through-your-tabs-quickly) are no longer present. Nor is the drop-down arrow button which shows you the list of currently open tabs. Furthermore, there does not seem be any option available to turn these features on. Is this a planned design change? How can I restore these features?