diff --git a/chrome/compact_proton.css b/chrome/compact_proton.css
new file mode 100644
index 0000000..2aa3e9d
--- /dev/null
+++ b/chrome/compact_proton.css
@@ -0,0 +1,3 @@
+/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/compact_proton.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 eed76c2..9990876 100644
--- a/html_resources/tagmap.json
+++ b/html_resources/tagmap.json
@@ -114,5 +114,6 @@
 "show_toolbars_in_popup_windows.css":["toolbars","popup"],
 "centered_tab_content.css":["tab","icon"],
 "window_control_fallback_for_custom_windows_theme.css":["window-controls","buttons","colors","patch"],
-"privatemode_indicator_as_menu_button.css":["icon","buttons"]
+"privatemode_indicator_as_menu_button.css":["icon","buttons"],
+"compact_proton.css":["menu","popups","tabs"]
 }
diff --git a/tags.csv b/tags.csv
index 58dd06c..d1da195 100644
--- a/tags.csv
+++ b/tags.csv
@@ -114,3 +114,4 @@ show_toolbars_in_popup_windows.css,toolbars,popup
 centered_tab_content.css,tab,icon
 window_control_fallback_for_custom_windows_theme.css,window-controls,buttons,colors,patch
 privatemode_indicator_as_menu_button.css,icon,buttons
+compact_proton.css,menu,popups,tabs