display: -moz-box !important

Till version 112 I used this in my userChrome.css to get back the close buttons on tabs, but only when I hover over them (active or inactive tabs): .tab-close-button{ display: none } .tabbrowser-tab:not([pinned]):hover .tab-close-button{ display: -moz-box !important } But now with version 113.0.1 it doesn't work at all and no X appears when I hover over my tabs. I tried adding #tabbrowser-tabs[closebuttons="activetab"] on top of the previous code, but it made the X appear all the time. How could I update this code so I get the desired result only when I hover over a tab?

.tabbrowser-tab:not([pinned]) .tab-close-button {
  display: none !important
}
.tabbrowser-tab:not([pinned]):hover .tab-close-button {
  display: inline-flex !important
}