How can I quickly open a new (blank) tab without going to File --> Open New Tab. There has to be a button I can add or a box that isn't checked somewhere. I used to be able to click in the blank space in the row of tabs to open a new tab, but with this latest Firefox update, if I click in the blank space now, it just "restores" my browser window.

To explain further - I know I can middle-click a link to open it in a new window, but if I'm on one page reading an article, and I want to open a new tab to look up a word or map or whatever, I need a faster way to open a new blank tab.