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Tab close button on the left in Firefox Quantum
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
.tabbrowser-tab .tab-throbber,
.tabbrowser-tab .tab-icon-image,
.tabbrowser-tab .tab-sharing-icon-overlay,
.tabbrowser-tab .tab-icon-overlay,
.tabbrowser-tab .tab-label-container,
.tabbrowser-tab .tab-icon-sound {
-moz-box-ordinal-group: 2 !important;
}
.tabbrowser-tab .tab-close-button {
margin-left: -2px !important;
margin-right: 4px !important;
}
.tabbrowser-tab:not([pinned="true"]):hover .tab-close-button {
display: -moz-box !important;
}
.tabbrowser-tab:not([pinned="true"]):hover .tab-icon-image {
display: none;
}
.tab-close-button {
display: none;
}
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