diff --git a/chrome/tab_loading_progress_bar.css b/chrome/tab_loading_progress_bar.css
new file mode 100644
index 0000000..1131ecc
--- /dev/null
+++ b/chrome/tab_loading_progress_bar.css
@@ -0,0 +1,33 @@
+/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/tab_loading_progress_bar.css made available under Mozilla Public License v. 2.0
+See the above repository for updates as well as full license text. */
+
+/* This style creates a fake loading progress bar to the bottom of a tab as a replacement for normal loading throbber */
+
+@keyframes tab-loading-line-anim{ from{ background-size: 0% } to { background-size: 20% } }
+.tab-background::after{
+    background-size: 90%;
+}
+.tabbrowser-tab:is([busy],[bursting]) > .tab-stack > .tab-background::after{
+  content: "";
+  display: -moz-box;
+  height: 2px;
+  background-color:transparent;
+  background-repeat: no-repeat;
+  background-image: linear-gradient(currentColor,currentColor);
+  transition: background-size 80ms ease-out;
+}
+.tabbrowser-tab[busy]:not([progress],[bursting]) > .tab-stack > .tab-background::after{
+  animation: tab-loading-line-anim 80ms ease;
+  background-size: 20%;
+  opacity: 0.5;
+}
+.tabbrowser-tab[busy][progress] > .tab-stack > .tab-background::after{
+  transition-duration: 2000ms;
+}
+.tabbrowser-tab[bursting] > .tab-stack > .tab-background::after{
+  transition: background-size 80ms ease-out, opacity 80ms linear;
+  background-size: 100%;
+  opacity: 0;
+}
+.tab-throbber{ display: none !important; }
+.tab-icon-image[src]{ display: -moz-box !important; }
diff --git a/html_resources/tagmap.json b/html_resources/tagmap.json
index ab55d94..b841553 100644
--- a/html_resources/tagmap.json
+++ b/html_resources/tagmap.json
@@ -152,5 +152,6 @@
 "window_control_fallback_for_custom_windows_theme.css":["window-control","buttons","colors","patch"],
 "window_control_force_linux_system_style.css":["window-control","buttons","icon"],
 "window_control_placeholder_support.css":["window-control","patch"],
-"fake_tab_tooltip.css":["tab","hack","popup"]
+"fake_tab_tooltip.css":["tab","hack","popup"],
+"tab_loading_progress_bar.css":["tab","effect"]
 }
diff --git a/tags.csv b/tags.csv
index f2f6739..924f3d9 100644
--- a/tags.csv
+++ b/tags.csv
@@ -152,3 +152,4 @@ window_control_fallback_for_custom_windows_theme.css,window-control,buttons,colo
 window_control_force_linux_system_style.css,window-control,buttons,icon
 window_control_placeholder_support.css,window-control,patch
 fake_tab_tooltip.css,tab,hack,popup
+tab_loading_progress_bar.css,tab,effect