diff --git a/chrome/extras/hidetabclosebutton.css b/chrome/extras/hidetabclosebutton.css
new file mode 100644
index 0000000..93338ad
--- /dev/null
+++ b/chrome/extras/hidetabclosebutton.css
@@ -0,0 +1,12 @@
+/* Hide tab close button when mouse not hovering over it */
+.tab-close-button {
+    transform: translateY(32px) !important;
+    margin-inline-start: -16px !important;
+    transition-property: margin, transform !important;
+    transition-duration: 200ms !important;
+    transition-timing-function: cubic-bezier(1, 0, 0, 1) !important;
+}
+:-moz-any(.tabbrowser-tab:hover:hover, .tabbrowser-tab[visuallyselected]) .tab-close-button {
+    transform: none !important;
+    margin-inline-start: 0 !important;
+}