Added Firefox theme settings to get my favorite look.

OSX/firefox_theme_settings.txt

@@ -0,0 +1,44 @@
+Clone it from here: https://github.com/Aris-t2/CustomCSSforFx
+
+
+Modify:
+- UserContent.css:
+
+@import "./css/aboutaddons/addons_manager_alternative_appearance_fx68.css"; /**/
+@import "./css/aboutaddons/addonlists_show_addon_version_number_fx68.css"; /**/
+@import "./css/aboutaddons/addonlists_private_browsing_notice_hidden.css"; /**/
+@import "./css/aboutaddons/recentupdates_category_always_visible.css"; /**/
+@import "./css/aboutpreferences/preferences_alternative_appearance.css"; /**/
+@import "./css/aboutlogins/aboutlogins_alternative_appearance.css"; /**/
+@import "./my_userContent.css"; /**/
+
+
+- userChrome.css:
+
+@import "./css/tabs/tabs_below_navigation_toolbar_fx65_v2_macOS.css"; /**/
+@import "./my_userChrome.css"; /**/
+
+
+
+
+Create file "my_userChrome.css" with:
+
+
+#navigator-toolbox {
+    position: relative;
+}
+
+.tabbrowser-tab {
+    height: calc(var(--tab-min-height_tnot) + 1px);
+}
+
+@media (-moz-proton) {
+    #TabsToolbar {
+	--tab-min-height: calc(var(--tab-min-height_tnot) + 1px);
+	--toolbarbutton-inner-padding: 4.5px !important;
+    }
+
+    .tab-content {
+	height: 90%;
+    }
+}