Add new css feature for FF113

CSS tweaks/Tabs/Tab-close-button-only-on-hover.as.css

@@ -0,0 +1,15 @@
+/* You can find an updated version here: https://github.com/Izheil/Quantum-Nox-Firefox-Dark-Full-Theme */
+/* Made by Izheil */
+/* Last updated: 19/12/2020 */
+
+/* Tab close button visible only on hover */
+#tabbrowser-tabs .tabbrowser-tab:not([pinned]) .tab-close-button {
+	display: none !important}
+
+#tabbrowser-tabs .tabbrowser-tab:not([pinned]):hover .tab-close-button {
+	visibility: visible !important;
+	display: block !important}
+
+#tabbrowser-tabs .tabbrowser-tab:not([pinned])[faviconized="true"]:hover .tab-close-button {
+	visibility: collapse !important;
+	display: none !important}

README.md

@@ -19,13 +19,14 @@ If you want to know how to change some colors of the theme, check the [wiki](htt
 
 Files updated:
 
-* Multirow*.uc.js: Updated multirow for FF110.
+- Multirow*.uc.js: Updated multirow for broken `--tab-growth` variable for FF113.
+- Tab-close-button-only-on-hover.as.css: Added a new CSS to show the close button on tabs only when hovering over the tabs.
 
-### Pre-Last update: 27/01/2023
+### Pre-Last update: 14/02/2023
 
 Files updated:
 
-* /root/*: Updated patch dependencies from xiaoxiaoflood's repository.
+- Multirow*.uc.js: Updated multirow for FF110.
 
 
 ### A note on people looking to replace some Tab Mix Plus features: