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diff --git a/browser/themes/osx/devedition.css b/browser/themes/osx/devedition.css
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+++ b/browser/themes/osx/devedition.css
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+% 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/.
+
+%include ../shared/devedition.inc.css
+
+:root {
+  --forwardbutton-width: 32px;
+}
+
+/* Use only 1px separator between nav toolbox and page content */
+#navigator-toolbox::after {
+  border-top-style: none;
+  margin-top: -1px;
+}
+
+/* Include extra space on left/right for dragging since there is no space above
+   the tabs */
+#main-window[tabsintitlebar] #TabsToolbar {
+  padding-left: 50px;
+  padding-right: 50px;
+  margin-bottom: 0; /* Don't overlap the inner highlight at the top of the nav-bar */
+}
+
+/* Get rid of 1px bright strip at the top of window */
+#main-window[tabsintitlebar] #titlebar-content {
+  background: var(--chrome-background-color);
+}
+
+/* Resize things so that the native titlebar is in line with the tabs */
+#main-window[tabsintitlebar] > #titlebar > #titlebar-content > #titlebar-buttonbox-container,
+#main-window[tabsintitlebar] > #titlebar > #titlebar-content > #titlebar-secondary-buttonbox > #titlebar-fullscreen-button {
+  margin-top: 6px;
+}
+
+/* Square back and forward buttons.  Need !important on these because there
+   are a lot of more specific selectors sprinkled around elsewhere for changing
+   background / shadows for different states */
+#back-button,
+#forward-button {
+  height: 24px !important;
+  box-shadow: none !important;
+  border: 1px solid var(--chrome-nav-bar-controls-border-color) !important;
+  background: var(--chrome-nav-buttons-background) !important;
+}
+
+#forward-button {
+  border-inline-start: none !important;
+  /* browser.css and friends set up the width of the button to be 32px.
+   * They then set margin-left to -2px to ensure the button is not too wide
+   * compared to the back button, and set padding-left to center the icon
+   * correctly.
+   * In our theme, the back and forward buttons are the same width, with the
+   * back button being 32px with 1px border on both sides. To ensure the
+   * forward button's content box looks like it is the same size with width
+   * set to 32px and a 1px border on only 1 side, we overlap by 1px, so both
+   * buttons end up with a content box that looks like it's 30px.
+   */
+  margin-left: -1px;
+  padding-left: 1px;
+}
+
+#forward-button > .toolbarbutton-icon {
+  margin-left: 0;
+  margin-right: 0;
+}
+
+#back-button:hover:not([disabled="true"]),
+#forward-button:hover:not([disabled="true"]) {
+  background: var(--chrome-nav-buttons-hover-background) !important;
+}
+
+#back-button {
+  border-radius: 3px 0 0 3px !important;
+  padding: 0 !important;
+  margin: 0 !important;
+}
+
+#back-button:hover:active:not([disabled="true"]) {
+  -moz-image-region: rect(18px, 54px, 36px, 36px);
+}
+
+/* Use smaller back button icon */
+@media (min-resolution: 2dppx) {
+  #back-button:hover:active:not([disabled="true"]) {
+    -moz-image-region: rect(36px, 108px, 72px, 72px);
+  }
+}
+
+/* Don't use the default background for tabs toolbar */
+#TabsToolbar {
+  -moz-appearance: none !important;
+}
+
+/* Prevent the hover styling from on the identity icon from overlapping the
+   urlbar border. */
+#identity-box {
+  margin-top: -1px !important;
+  margin-bottom: -1px !important;
+  padding-top: 3px !important;
+  padding-bottom: 3px !important;
+}
+
+:root[devtoolstheme="dark"] .findbar-closebutton:not(:hover),
+/* Tab styling - make sure to use an inverted icon for the selected tab
+   (brighttext only covers the unselected tabs) */
+.tab-close-button[selected=true]:not(:hover) {
+  -moz-image-region: rect(0, 64px, 16px, 48px);
+}
+@media (min-resolution: 2dppx) {
+  :root[devtoolstheme="dark"] .findbar-closebutton:not(:hover),
+  .tab-close-button[selected=true]:not(:hover) {
+    -moz-image-region: rect(0, 128px, 32px, 96px);
+  }
+}
+
+.ac-type-icon {
+  /* Left-align the type icon in awesomebar popup results with the icon in the
+     urlbar. */
+  margin-inline-start: 14px;
+}