display:table- is exactly the kind of hack the parent is ranting about. https://developer.mozilla.org/en-US/docs/CSS/Using_CSS_flexible_boxes#Notes https://dev

display:table- is exactly the kind of hack the parent is ranting about. https://developer.mozilla.org/en-US/docs/CSS/Using_CSS_flexible_boxes#Notes https://developer.mozilla.org/en-US/docs/CSS/Using_CSS_flexi... [2] Firefox supports only single-line flexbox. To activate flexbox support, for Firefox 18 and 19, the user has to change the about:config preference "layout.css.flexbox.enabled" to true.