--- a/devtools/client/themes/tooltips.css
+++ b/devtools/client/themes/tooltips.css
@@ -536,82 +536,16 @@
 }
 
 .event-tooltip-attributes {
   margin: 0;
   font-size: 9px;
   padding-top: 2px;
 }
 
-/*
- * Tooltip: JS stack traces
- */
-
-.stack-trace-tooltip {
-  direction: ltr;
-  height: 100%;
-  overflow-y: auto;
-}
-
-.stack-trace-tooltip > .stack-frame {
-  margin-left: 5px;
-  margin-right: 5px;
-}
-
-.stack-trace-tooltip > .stack-frame:first-child {
-  margin-top: 5px;
-}
-
-.stack-trace-tooltip > .stack-frame:last-child {
-  margin-bottom: 5px;
-}
-
-.stack-frame-call {
-  color: var(--theme-body-color-alt);
-  cursor: pointer;
-  display: flex;
-}
-
-.stack-frame-call:hover {
-  background-color: var(--theme-selection-background-hover);
-}
-
-.stack-frame-async {
-  color: var(--theme-body-color-inactive);
-}
-
-.stack-frame-function-name {
-  color: var(--theme-highlight-blue);
-  max-width: 50%;
-  margin-inline-end: 1em;
-  white-space: nowrap;
-  overflow: hidden;
-  text-overflow: ellipsis;
-}
-
-.stack-frame-source-name {
-  flex: 1 1;
-  /* Makes the file name truncated (and ellipsis shown) on the left side */
-  direction: rtl;
-  text-align: right;
-  white-space: nowrap;
-  overflow: hidden;
-  text-overflow: ellipsis;
-}
-
-/* Enforce LTR direction for the file name - fixes bug 1290056 */
-.stack-frame-source-name-inner {
-  direction: ltr;
-  unicode-bidi: embed;
-}
-
-.stack-frame-line {
-  color: var(--theme-highlight-orange);
-}
-
 /* Tooltip: HTML Search */
 
 #searchbox-panel-listbox {
   width: 250px;
   max-width: 250px;
   overflow-x: hidden;
 }