--- a/devtools/client/jar.mn
+++ b/devtools/client/jar.mn
@@ -121,16 +121,17 @@ devtools.jar:
     skin/images/angle-swatch.svg (themes/images/angle-swatch.svg)
     skin/images/pseudo-class.svg (themes/images/pseudo-class.svg)
     skin/images/controls.png (themes/images/controls.png)
     skin/images/controls@2x.png (themes/images/controls@2x.png)
     skin/images/animation-fast-track.svg (themes/images/animation-fast-track.svg)
     skin/images/performance-details-waterfall.svg (themes/images/performance-details-waterfall.svg)
     skin/images/performance-details-call-tree.svg (themes/images/performance-details-call-tree.svg)
     skin/images/performance-details-flamegraph.svg (themes/images/performance-details-flamegraph.svg)
+    skin/breadcrumbs.css (themes/breadcrumbs.css)
     skin/widgets.css (themes/widgets.css)
     skin/images/power.svg (themes/images/power.svg)
     skin/images/filetypes/dir-close.svg (themes/images/filetypes/dir-close.svg)
     skin/images/filetypes/dir-open.svg (themes/images/filetypes/dir-open.svg)
     skin/images/filetypes/globe.svg (themes/images/filetypes/globe.svg)
     skin/images/commandline-icon.svg (themes/images/commandline-icon.svg)
     skin/images/alerticon-warning.png (themes/images/alerticon-warning.png)
     skin/images/alerticon-warning@2x.png (themes/images/alerticon-warning@2x.png)

new file mode 100644
--- /dev/null
+++ b/devtools/client/themes/breadcrumbs.css
@@ -0,0 +1,341 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+.breadcrumbs-widget-container {
+  margin-inline-end: 3px;
+  max-height: 24px; /* Set max-height for proper sizing on linux */
+  height: 24px; /* Set height to prevent starting small waiting for content */
+}
+
+.scrollbutton-up,
+.scrollbutton-down {
+  -moz-appearance: none;
+  background: transparent;
+  box-shadow: none;
+  border: none;
+  list-style-image: none;
+  margin: 0;
+  padding: 0;
+}
+
+.scrollbutton-up > .toolbarbutton-icon,
+.scrollbutton-down > .toolbarbutton-icon {
+  -moz-appearance: none;
+  width: 7px;
+  height: 16px;
+  background-size: 14px 16px;
+  background-position: 0 center;
+  background-repeat: no-repeat;
+  background-image: url("images/breadcrumbs-scrollbutton.png");
+  list-style-image: none;
+  margin: 0 8px;
+  padding: 0;
+}
+
+@media (min-resolution: 1.1dppx) {
+  .scrollbutton-up > .toolbarbutton-icon,
+  .scrollbutton-down > .toolbarbutton-icon {
+    background-image: url("images/breadcrumbs-scrollbutton@2x.png");
+  }
+}
+
+.scrollbutton-up:not([disabled]):active:hover > .toolbarbutton-icon,
+.scrollbutton-down:not([disabled]):active:hover > .toolbarbutton-icon {
+  background-position: -7px center;
+}
+
+.scrollbutton-up[disabled] > .toolbarbutton-icon,
+.scrollbutton-down[disabled] > .toolbarbutton-icon {
+  opacity: 0.5;
+}
+
+/* Draw shadows to indicate there is more content 'behind' scrollbuttons. */
+.scrollbutton-up:-moz-locale-dir(ltr):not(:dir(rtl)),
+.scrollbutton-up:dir(ltr),
+.scrollbutton-down:-moz-locale-dir(rtl),
+.scrollbutton-down:dir(rtl) {
+  border-right: solid 1px rgba(255, 255, 255, .1);
+  border-left: solid 1px transparent;
+  box-shadow: 3px 0px 3px -3px var(--theme-sidebar-background);
+}
+
+.scrollbutton-down:-moz-locale-dir(ltr):not(:dir(rtl)),
+.scrollbutton-down:dir(ltr),
+.scrollbutton-up:-moz-locale-dir(rtl),
+.scrollbutton-up:dir(rtl) {
+  border-right: solid 1px transparent;
+  border-left: solid 1px rgba(255, 255, 255, .1);
+  box-shadow: -3px 0px 3px -3px var(--theme-sidebar-background);
+}
+
+.scrollbutton-up[disabled],
+.scrollbutton-down[disabled] {
+  box-shadow: none;
+  border-color: transparent;
+}
+
+.scrollbutton-up > .toolbarbutton-icon:-moz-locale-dir(rtl),
+.scrollbutton-up > .toolbarbutton-icon:dir(rtl),
+.scrollbutton-down > .toolbarbutton-icon:-moz-locale-dir(ltr):not(:dir(rtl)),
+.scrollbutton-down > .toolbarbutton-icon:dir(ltr) {
+  transform: scaleX(-1);
+}
+
+.breadcrumbs-widget-item {
+  background-color: transparent;
+  -moz-appearance: none;
+  min-height: 24px;
+  min-width: 65px;
+  margin: 0;
+  padding: 0 8px 0 20px;
+  border: none;
+  outline: none;
+  color: hsl(210,30%,85%);
+  position: relative;
+}
+
+.breadcrumbs-widget-item > .button-box {
+  border: none;
+  padding-top: 0;
+  padding-bottom: 0;
+}
+
+:root[platform="win"] .breadcrumbs-widget-item:-moz-focusring > .button-box {
+  border-width: 0;
+}
+
+.breadcrumbs-widget-item::before {
+  content: "";
+  position: absolute;
+  top: 1px;
+  offset-inline-start: 0;
+  width: 12px;
+  height: 22px;
+  background-repeat: no-repeat;
+  /* Given the 1/2 aspect ratio of the separator pseudo-element and the 45deg angle of
+     the arrow shape, we need the arrow edges to be at this position from the start of
+     the gradient line. */
+  --position: 66.5%;
+  /* The color of the thin line in the arrow-shaped separator between 2 unselected
+     crumbs. There is no theme variable for this, this used to be an image. */
+  --line-color: #ACACAC;
+  --background-color: var(--theme-body-background);
+}
+
+#debugger-toolbar .breadcrumbs-widget-item::before {
+  --background-color: var(--theme-toolbar-background);
+}
+
+.theme-dark .breadcrumbs-widget-item::before {
+  --line-color: #6E6E6E;
+}
+
+.breadcrumbs-widget-item:first-child::before {
+  /* The first crumb does not need any separator before itself */
+  content: unset;
+}
+
+.breadcrumbs-widget-item:dir(rtl)::before {
+  transform: scaleX(-1);
+}
+
+.breadcrumbs-widget-item:not([checked])::before {
+  background-color: var(--background-color);
+  background-image:
+    linear-gradient(45deg,
+                    var(--background-color) 30%,
+                    transparent),
+    linear-gradient(-45deg,
+                    transparent,
+                    var(--background-color) 70%,
+                    var(--background-color)),
+    linear-gradient(45deg,
+                    transparent var(--position),
+                    var(--line-color) var(--position),
+                    var(--line-color) calc(var(--position) + 1px),
+                    transparent 0),
+    linear-gradient(-45deg,
+                    transparent calc(100% - var(--position)),
+                    var(--line-color) calc(100% - var(--position)),
+                    var(--line-color) calc(calc(100% - var(--position)) + 1px),
+                    transparent 0);
+  background-size:
+    100% 50%,
+    100% 50%,
+    100%,
+    100%;
+  background-position:
+    left bottom,
+    left top,
+    left top,
+    left top;
+}
+
+.breadcrumbs-widget-item[checked] + .breadcrumbs-widget-item::before {
+  background-color: var(--theme-selection-background);
+  background-image:
+    linear-gradient(45deg,
+                    transparent var(--position),
+                    var(--background-color) 0),
+    linear-gradient(-45deg,
+                    var(--background-color) calc(100% - var(--position)),
+                    transparent 0);
+  background-size: unset;
+}
+
+.breadcrumbs-widget-item[checked]::before {
+  background-image:
+    linear-gradient(45deg,
+                    transparent var(--position),
+                    var(--theme-selection-background) 0),
+    linear-gradient(-45deg,
+                    var(--theme-selection-background) calc(100% - var(--position)),
+                    var(--background-color) 0);
+}
+
+.breadcrumbs-widget-item[checked] {
+  background-color: var(--theme-selection-background);
+}
+
+.breadcrumbs-widget-item:first-child {
+  background-image: none;
+}
+
+/* RTL support: move the images that were on the left to the right,
+ * and move images that were on the right to the left.
+ */
+.breadcrumbs-widget-item:dir(rtl) {
+  padding: 0 20px 0 8px;
+}
+
+.breadcrumbs-widget-item:dir(rtl),
+.breadcrumbs-widget-item[checked] + .breadcrumbs-widget-item:dir(rtl) {
+  background-position: center right;
+}
+
+.breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-id,
+.breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-tag,
+.breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-pseudo-classes,
+.breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-classes {
+  color: var(--theme-selection-color);
+}
+
+.theme-dark .breadcrumbs-widget-item {
+  color: var(--theme-selection-color);
+}
+
+.theme-light .breadcrumbs-widget-item {
+  color: var(--theme-body-color);
+}
+
+.breadcrumbs-widget-item-id {
+  color: var(--theme-body-color-alt);
+}
+
+.breadcrumbs-widget-item-classes {
+  color: var(--theme-content-color1);
+}
+
+.breadcrumbs-widget-item-pseudo-classes {
+  color: var(--theme-highlight-lightorange);
+}
+
+.theme-dark .breadcrumbs-widget-item:not([checked]):hover label {
+  color: white;
+}
+
+.theme-light .breadcrumbs-widget-item:not([checked]):hover label {
+  color: black;
+}
+
+/* Firebug theme support for breadcrumbs widget. */
+
+.theme-firebug .breadcrumbs-widget-item {
+  margin-inline-start: 10px;
+  margin-inline-end: 1px;
+  background-image: none;
+  border: 1px solid transparent;
+  color: #141414;
+  border-radius: 2px;
+  min-width: 0;
+  min-height: 0;
+  padding: 0;
+  font-size: var(--theme-toolbar-font-size);
+}
+
+.theme-firebug .breadcrumbs-widget-item:hover {
+  border-color: rgba(0, 0, 0, 0.2);
+  background: transparent linear-gradient(
+              rgba(255, 255, 255, 0.4),
+              rgba(255, 255, 255, 0.2)) no-repeat;
+  box-shadow: 1px 1px 1px rgba(255, 255, 255, 0.6) inset,
+              0 0 1px rgba(255, 255, 255, 0.6) inset,
+              0 0 2px rgba(0, 0, 0, 0.05);
+}
+
+.theme-firebug .breadcrumbs-widget-item > .button-box {
+  padding-left: 0;
+  padding-right: 0;
+}
+
+.theme-firebug .breadcrumbs-widget-item:first-child {
+  margin: 0;
+}
+
+.theme-firebug .breadcrumbs-widget-item:not(:first-child)::before {
+  content: url(chrome://devtools/skin/images/firebug/breadcrumbs-divider.svg);
+  background: none;
+  position: relative;
+  left: -3px;
+  margin: 0 0 0 -5px;
+  padding: 0;
+  width: 5px;
+}
+
+/* Breadcrumbs Separators (reset selection styles) */
+.theme-firebug .breadcrumbs-widget-item[checked],
+.theme-firebug .breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-id,
+.theme-firebug .breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-tag,
+.theme-firebug .breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-pseudo-classes,
+.theme-firebug .breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-classes {
+  background: none;
+  font-weight: bold;
+  color: inherit;
+}
+
+/* The first rule is there only to make sure the default rule from
+widgets.css is overwritten. */
+.theme-firebug .breadcrumbs-widget-item[checked] + .breadcrumbs-widget-item {
+  background: none;
+}
+
+.theme-firebug .breadcrumbs-widget-item .breadcrumbs-widget-item-tag {
+  padding-left: 4px;
+  padding-right: 4px;
+}
+
+/* Breadcrumbs Scrolling Buttons */
+
+.theme-firebug .breadcrumbs-widget-container .scrollbutton-up,
+.theme-firebug .breadcrumbs-widget-container .scrollbutton-down {
+  padding: 0;
+  box-shadow: none;
+  outline: 1px solid var(--theme-splitter-color);
+}
+
+.theme-firebug .breadcrumbs-widget-container .scrollbutton-up:hover,
+.theme-firebug .breadcrumbs-widget-container .scrollbutton-down:hover {
+  border: 1px transparent solid !important;
+  box-shadow: none !important;
+}
+
+.theme-firebug .breadcrumbs-widget-container .scrollbutton-up:active,
+.theme-firebug .breadcrumbs-widget-container .scrollbutton-down:active {
+  background: none !important;
+}
+
+.theme-firebug .breadcrumbs-widget-container .scrollbutton-up:not([disabled]):active:hover > .toolbarbutton-icon,
+.theme-firebug .breadcrumbs-widget-container .scrollbutton-down:not([disabled]):active:hover > .toolbarbutton-icon {
+  background-position: 0 center;
+}

--- a/devtools/client/themes/widgets.css
+++ b/devtools/client/themes/widgets.css
@@ -1,13 +1,15 @@
 /* vim:set ts=2 sw=2 sts=2 et: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+@import url(chrome://devtools/skin/breadcrumbs.css);
+
 .theme-dark {
   --table-splitter-color: rgba(255,255,255,0.15);
   --table-zebra-background: rgba(255,255,255,0.05);
   --sidemenu-selected-arrow: url(images/item-arrow-dark-ltr.svg);
   --sidemenu-selected-arrow-rtl: url(images/item-arrow-dark-rtl.svg);
   --delete-icon: url(chrome://devtools/skin/images/vview-delete.png);
   --delete-icon-2x: url(chrome://devtools/skin/images/vview-delete@2x.png);
 }
@@ -108,356 +110,16 @@
     /* To hide generic-toggled-pane, negative margins are applied dynamically.
      * If a vertical layout, the pane is on the bottom and should be hidden
      * using negative bottom margin only.
      */
     margin-inline-end: 0 !important;
   }
 }
 
-/* BreacrumbsWidget */
-
-.breadcrumbs-widget-container {
-  margin-inline-end: 3px;
-  max-height: 24px; /* Set max-height for proper sizing on linux */
-  height: 24px; /* Set height to prevent starting small waiting for content */
-}
-
-.scrollbutton-up,
-.scrollbutton-down {
-  -moz-appearance: none;
-  background: transparent;
-  box-shadow: none;
-  border: none;
-  list-style-image: none;
-  margin: 0;
-  padding: 0;
-}
-
-.scrollbutton-up > .toolbarbutton-icon,
-.scrollbutton-down > .toolbarbutton-icon {
-  -moz-appearance: none;
-  width: 7px;
-  height: 16px;
-  background-size: 14px 16px;
-  background-position: 0 center;
-  background-repeat: no-repeat;
-  background-image: url("images/breadcrumbs-scrollbutton.png");
-  list-style-image: none;
-  margin: 0 8px;
-  padding: 0;
-}
-
-@media (min-resolution: 1.1dppx) {
-  .scrollbutton-up > .toolbarbutton-icon,
-  .scrollbutton-down > .toolbarbutton-icon {
-    background-image: url("images/breadcrumbs-scrollbutton@2x.png");
-  }
-}
-
-.scrollbutton-up:not([disabled]):active:hover > .toolbarbutton-icon,
-.scrollbutton-down:not([disabled]):active:hover > .toolbarbutton-icon {
-  background-position: -7px center;
-}
-
-.scrollbutton-up[disabled] > .toolbarbutton-icon,
-.scrollbutton-down[disabled] > .toolbarbutton-icon {
-  opacity: 0.5;
-}
-
-/* Draw shadows to indicate there is more content 'behind' scrollbuttons. */
-.scrollbutton-up:-moz-locale-dir(ltr):not(:dir(rtl)),
-.scrollbutton-up:dir(ltr),
-.scrollbutton-down:-moz-locale-dir(rtl),
-.scrollbutton-down:dir(rtl) {
-  border-right: solid 1px rgba(255, 255, 255, .1);
-  border-left: solid 1px transparent;
-  box-shadow: 3px 0px 3px -3px var(--theme-sidebar-background);
-}
-
-.scrollbutton-down:-moz-locale-dir(ltr):not(:dir(rtl)),
-.scrollbutton-down:dir(ltr),
-.scrollbutton-up:-moz-locale-dir(rtl),
-.scrollbutton-up:dir(rtl) {
-  border-right: solid 1px transparent;
-  border-left: solid 1px rgba(255, 255, 255, .1);
-  box-shadow: -3px 0px 3px -3px var(--theme-sidebar-background);
-}
-
-.scrollbutton-up[disabled],
-.scrollbutton-down[disabled] {
-  box-shadow: none;
-  border-color: transparent;
-}
-
-.scrollbutton-up > .toolbarbutton-icon:-moz-locale-dir(rtl),
-.scrollbutton-up > .toolbarbutton-icon:dir(rtl),
-.scrollbutton-down > .toolbarbutton-icon:-moz-locale-dir(ltr):not(:dir(rtl)),
-.scrollbutton-down > .toolbarbutton-icon:dir(ltr) {
-  transform: scaleX(-1);
-}
-
-.breadcrumbs-widget-item {
-  background-color: transparent;
-  -moz-appearance: none;
-  min-height: 24px;
-  min-width: 65px;
-  margin: 0;
-  padding: 0 8px 0 20px;
-  border: none;
-  outline: none;
-  color: hsl(210,30%,85%);
-  position: relative;
-}
-
-.breadcrumbs-widget-item > .button-box {
-  border: none;
-  padding-top: 0;
-  padding-bottom: 0;
-}
-
-:root[platform="win"] .breadcrumbs-widget-item:-moz-focusring > .button-box {
-  border-width: 0;
-}
-
-.breadcrumbs-widget-item::before {
-  content: "";
-  position: absolute;
-  top: 1px;
-  offset-inline-start: 0;
-  width: 12px;
-  height: 22px;
-  background-repeat: no-repeat;
-  /* Given the 1/2 aspect ratio of the separator pseudo-element and the 45deg angle of
-     the arrow shape, we need the arrow edges to be at this position from the start of
-     the gradient line. */
-  --position: 66.5%;
-  /* The color of the thin line in the arrow-shaped separator between 2 unselected
-     crumbs. There is no theme variable for this, this used to be an image. */
-  --line-color: #ACACAC;
-  --background-color: var(--theme-body-background);
-}
-
-#debugger-toolbar .breadcrumbs-widget-item::before {
-  --background-color: var(--theme-toolbar-background);
-}
-
-.theme-dark .breadcrumbs-widget-item::before {
-  --line-color: #6E6E6E;
-}
-
-.breadcrumbs-widget-item:first-child::before {
-  /* The first crumb does not need any separator before itself */
-  content: unset;
-}
-
-.breadcrumbs-widget-item:dir(rtl)::before {
-  transform: scaleX(-1);
-}
-
-.breadcrumbs-widget-item:not([checked])::before {
-  background-color: var(--background-color);
-  background-image:
-    linear-gradient(45deg,
-                    var(--background-color) 30%,
-                    transparent),
-    linear-gradient(-45deg,
-                    transparent,
-                    var(--background-color) 70%,
-                    var(--background-color)),
-    linear-gradient(45deg,
-                    transparent var(--position),
-                    var(--line-color) var(--position),
-                    var(--line-color) calc(var(--position) + 1px),
-                    transparent 0),
-    linear-gradient(-45deg,
-                    transparent calc(100% - var(--position)),
-                    var(--line-color) calc(100% - var(--position)),
-                    var(--line-color) calc(calc(100% - var(--position)) + 1px),
-                    transparent 0);
-  background-size:
-    100% 50%,
-    100% 50%,
-    100%,
-    100%;
-  background-position:
-    left bottom,
-    left top,
-    left top,
-    left top;
-}
-
-.breadcrumbs-widget-item[checked] + .breadcrumbs-widget-item::before {
-  background-color: var(--theme-selection-background);
-  background-image:
-    linear-gradient(45deg,
-                    transparent var(--position),
-                    var(--background-color) 0),
-    linear-gradient(-45deg,
-                    var(--background-color) calc(100% - var(--position)),
-                    transparent 0);
-  background-size: unset;
-}
-
-.breadcrumbs-widget-item[checked]::before {
-  background-image:
-    linear-gradient(45deg,
-                    transparent var(--position),
-                    var(--theme-selection-background) 0),
-    linear-gradient(-45deg,
-                    var(--theme-selection-background) calc(100% - var(--position)),
-                    var(--background-color) 0);
-}
-
-.breadcrumbs-widget-item[checked] {
-  background-color: var(--theme-selection-background);
-}
-
-.breadcrumbs-widget-item:first-child {
-  background-image: none;
-}
-
-/* RTL support: move the images that were on the left to the right,
- * and move images that were on the right to the left.
- */
-.breadcrumbs-widget-item:dir(rtl) {
-  padding: 0 20px 0 8px;
-}
-
-.breadcrumbs-widget-item:dir(rtl),
-.breadcrumbs-widget-item[checked] + .breadcrumbs-widget-item:dir(rtl) {
-  background-position: center right;
-}
-
-.breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-id,
-.breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-tag,
-.breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-pseudo-classes,
-.breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-classes {
-  color: var(--theme-selection-color);
-}
-
-.theme-dark .breadcrumbs-widget-item {
-  color: var(--theme-selection-color);
-}
-
-.theme-light .breadcrumbs-widget-item {
-  color: var(--theme-body-color);
-}
-
-.breadcrumbs-widget-item-id {
-  color: var(--theme-body-color-alt);
-}
-
-.breadcrumbs-widget-item-classes {
-  color: var(--theme-content-color1);
-}
-
-.breadcrumbs-widget-item-pseudo-classes {
-  color: var(--theme-highlight-lightorange);
-}
-
-.theme-dark .breadcrumbs-widget-item:not([checked]):hover label {
-  color: white;
-}
-
-.theme-light .breadcrumbs-widget-item:not([checked]):hover label {
-  color: black;
-}
-
-/* Firebug theme support for breadcrumbs widget. */
-
-.theme-firebug .breadcrumbs-widget-item {
-  margin-inline-start: 10px;
-  margin-inline-end: 1px;
-  background-image: none;
-  border: 1px solid transparent;
-  color: #141414;
-  border-radius: 2px;
-  min-width: 0;
-  min-height: 0;
-  padding: 0;
-  font-size: var(--theme-toolbar-font-size);
-}
-
-.theme-firebug .breadcrumbs-widget-item:hover {
-  border-color: rgba(0, 0, 0, 0.2);
-  background: transparent linear-gradient(
-              rgba(255, 255, 255, 0.4),
-              rgba(255, 255, 255, 0.2)) no-repeat;
-  box-shadow: 1px 1px 1px rgba(255, 255, 255, 0.6) inset,
-              0 0 1px rgba(255, 255, 255, 0.6) inset,
-              0 0 2px rgba(0, 0, 0, 0.05);
-}
-
-.theme-firebug .breadcrumbs-widget-item > .button-box {
-  padding-left: 0;
-  padding-right: 0;
-}
-
-.theme-firebug .breadcrumbs-widget-item:first-child {
-  margin: 0;
-}
-
-.theme-firebug .breadcrumbs-widget-item:not(:first-child)::before {
-  content: url(chrome://devtools/skin/images/firebug/breadcrumbs-divider.svg);
-  background: none;
-  position: relative;
-  left: -3px;
-  margin: 0 0 0 -5px;
-  padding: 0;
-  width: 5px;
-}
-
-/* Breadcrumbs Separators (reset selection styles) */
-.theme-firebug .breadcrumbs-widget-item[checked],
-.theme-firebug .breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-id,
-.theme-firebug .breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-tag,
-.theme-firebug .breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-pseudo-classes,
-.theme-firebug .breadcrumbs-widget-item[checked] .breadcrumbs-widget-item-classes {
-  background: none;
-  font-weight: bold;
-  color: inherit;
-}
-
-/* The first rule is there only to make sure the default rule from
-widgets.css is overwritten. */
-.theme-firebug .breadcrumbs-widget-item[checked] + .breadcrumbs-widget-item {
-  background: none;
-}
-
-.theme-firebug .breadcrumbs-widget-item .breadcrumbs-widget-item-tag {
-  padding-left: 4px;
-  padding-right: 4px;
-}
-
-/* Breadcrumbs Scrolling Buttons */
-
-.theme-firebug .breadcrumbs-widget-container .scrollbutton-up,
-.theme-firebug .breadcrumbs-widget-container .scrollbutton-down {
-  padding: 0;
-  box-shadow: none;
-  outline: 1px solid var(--theme-splitter-color);
-}
-
-.theme-firebug .breadcrumbs-widget-container .scrollbutton-up:hover,
-.theme-firebug .breadcrumbs-widget-container .scrollbutton-down:hover {
-  border: 1px transparent solid !important;
-  box-shadow: none !important;
-}
-
-.theme-firebug .breadcrumbs-widget-container .scrollbutton-up:active,
-.theme-firebug .breadcrumbs-widget-container .scrollbutton-down:active {
-  background: none !important;
-}
-
-.theme-firebug .breadcrumbs-widget-container .scrollbutton-up:not([disabled]):active:hover > .toolbarbutton-icon,
-.theme-firebug .breadcrumbs-widget-container .scrollbutton-down:not([disabled]):active:hover > .toolbarbutton-icon {
-  background-position: 0 center;
-}
-
 /* SimpleListWidget */
 
 .simple-list-widget-container {
   /* Hack: force hardware acceleration */
   transform: translateZ(1px);
 }
 
 .simple-list-widget-item.selected {