diff --git a/chrome/shrinking_pinned_tabs.css b/chrome/shrinking_pinned_tabs.css
new file mode 100644
index 0000000..305e828
--- /dev/null
+++ b/chrome/shrinking_pinned_tabs.css
@@ -0,0 +1,16 @@
+/*Make pinned tab width shrink dynamically, similar to unpinned tab width.*/
+
+#tabbrowser-arrowscrollbox:not([overflowing]) .tabbrowser-tab[pinned] {
+  flex-grow: 10;
+  -moz-box-flex: 10;
+  max-width: 32px;
+}
+
+#tabbrowser-arrowscrollbox:not([overflowing]) .tab-content[pinned] {
+  padding: 0px !important;
+  -moz-box-pack: center;
+}
+
+.tab-label-container[pinned] {
+  display: none;
+}