diff --git a/README.md b/README.md
index 7bdb551..9621890 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,5 @@
 # dotfiles
 
 ## Notes
-1. create hard link from _firefox/userChrome.css_ to _.mozilla/firefox/\<profile>/chrome/userChrome.css
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+1. create hard link from _firefox/userChrome.css_ to _.mozilla/firefox/\<profile>/chrome/userChrome.css
+1. add content of TST-config to the TST config
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diff --git a/firefox/TST-config.css b/firefox/TST-config.css
new file mode 100644
index 0000000..ce4a4ef
--- /dev/null
+++ b/firefox/TST-config.css
@@ -0,0 +1,27 @@
+/* Hide border on tab bar, force its state to 'scroll', adjust margin-left for width of scrollbar. */ 
+#tabbar { border: 0; overflow-y: scroll !important; margin-left: -12px !important; scrollbar-width: auto; }
+
+/* Hide .twisty and adjust margins so favicons have 7px on left. */
+tab-item .twisty {
+    visibility: hidden;
+    margin-left: -12px;
+}
+
+/* Push tab labels slightly to the right so they're completely hidden in collapsed state */
+tab-item .label {
+    margin-left: 7px;
+}
+
+/* Hide close buttons on tabs. */
+tab-item .closebox {
+    visibility: collapse;
+}
+
+tab-item:hover .closebox {
+    visibility: initial;
+}
+
+/* Hide sound playing/muted button. */
+.sound-button::before {
+    display: none !important;
+}