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#main-window[tabsontop="true"][autohide="true"] .titlebar-placeholder {
display: -moz-box!important;
}
And nothing happened! Then I maximized and then unmaximized the window and the spaces appeared. Looking in DOMI, a width attribute is added to the titlebar-placeholders when you go into maximize mode, but not before. So I think you are right, the only way to do that part is to programmatically set the width, which is what Firefox does just at a different time.