diff --git a/chrome/tab_line_loading_indicator.css b/chrome/tab_line_loading_indicator.css
new file mode 100644
index 0000000..f141488
--- /dev/null
+++ b/chrome/tab_line_loading_indicator.css
@@ -0,0 +1,3 @@
+/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/tab_line_loading_indicator.css made available under Mozilla Public License v. 2.0
+See the above repository for updates as well as full license text. */
+
diff --git a/html_resources/tagmap.json b/html_resources/tagmap.json
index dfd2e72..dba4502 100644
--- a/html_resources/tagmap.json
+++ b/html_resources/tagmap.json
@@ -104,5 +104,6 @@
 "vertical_context_navigation_v2.css":["navigation","menu","popup"],
 "vertical_menubar.css":["menubar","hack"],
 "vertical_popup_menubar.css":["menubar","menu","toolbars","popup"],
-"window_control_placeholder_support.css":["window-control","patch"]
+"window_control_placeholder_support.css":["window-control","patch"],
+"tab_line_loading_indicator.css":["tab","icon","effect"]
 }
diff --git a/tags.csv b/tags.csv
index 3894475..c7bdfda 100644
--- a/tags.csv
+++ b/tags.csv
@@ -104,3 +104,4 @@ vertical_context_navigation_v2.css,navigation,menu,popup
 vertical_menubar.css,menubar,hack
 vertical_popup_menubar.css,menubar,menu,toolbars,popup
 window_control_placeholder_support.css,window-control,patch
+tab_line_loading_indicator.css,tab,icon,effect