Refactor tab management and update CSS for improved layout and performance

src/browser/base/content/navigator-toolbox-inc-xhtml.patch

@@ -1,5 +1,5 @@
 diff --git a/browser/base/content/navigator-toolbox.inc.xhtml b/browser/base/content/navigator-toolbox.inc.xhtml
-index a0a382643a2f74b6d789f3641ef300eed202d5e9..340475da315e67b2dd4f93567547cde703a90ee8 100644
+index a0a382643a2f74b6d789f3641ef300eed202d5e9..fd60aceee18e22d40c7d86506408803e3f4ffd45 100644
 --- a/browser/base/content/navigator-toolbox.inc.xhtml
 +++ b/browser/base/content/navigator-toolbox.inc.xhtml
 @@ -2,7 +2,7 @@
@@ -40,17 +40,18 @@ index a0a382643a2f74b6d789f3641ef300eed202d5e9..340475da315e67b2dd4f93567547cde7
          <tabs id="tabbrowser-tabs"
                is="tabbrowser-tabs"
                aria-multiselectable="true"
-@@ -50,6 +50,9 @@
+@@ -50,6 +50,10 @@
                tooltip="tabbrowser-tab-tooltip"
                orient="horizontal"
                stopwatchid="FX_TAB_CLICK_MS">
 +<html:div id="zen-essentials-container" skipintoolbarset="true"></html:div>
 +<hbox id="zen-current-workspace-indicator-container"></hbox>
 +<html:div id="zen-browser-tabs-wrapper">
++<html:div id="zen-browser-tabs-container">
            <hbox class="tab-drop-indicator" hidden="true"/>
  # If the name (tabbrowser-arrowscrollbox) or structure of this changes
  # significantly, there is an optimization in
-@@ -57,7 +60,7 @@
+@@ -57,7 +61,7 @@
  # the current structure that we may want to revisit.
            <html:div id="vertical-pinned-tabs-container" tabindex="-1"></html:div>
            <html:div id="vertical-pinned-tabs-container-separator"></html:div>
@@ -59,15 +60,16 @@ index a0a382643a2f74b6d789f3641ef300eed202d5e9..340475da315e67b2dd4f93567547cde7
              <tab is="tabbrowser-tab" class="tabbrowser-tab" selected="true" visuallyselected="" fadein=""/>
              <hbox id="tabbrowser-arrowscrollbox-periphery">
                <toolbartabstop/>
-@@ -75,6 +78,7 @@
+@@ -75,6 +79,8 @@
                                tooltip="dynamic-shortcut-tooltip"
                                data-l10n-id="tabs-toolbar-new-tab"/>
            <html:span id="tabbrowser-tab-a11y-desc" hidden="true"/>
++</html:div>
 +</html:div>
          </tabs>
  
          <toolbarbutton id="new-tab-button"
-@@ -100,11 +104,12 @@
+@@ -100,11 +106,12 @@
  #include private-browsing-indicator.inc.xhtml
      <toolbarbutton id="content-analysis-indicator"
                     class="toolbarbutton-1 content-analysis-indicator-icon"/>
@@ -83,7 +85,7 @@ index a0a382643a2f74b6d789f3641ef300eed202d5e9..340475da315e67b2dd4f93567547cde7
    <toolbar id="nav-bar"
             class="browser-toolbar chromeclass-location"
             data-l10n-id="navbar-accessible"
-@@ -490,10 +495,12 @@
+@@ -490,10 +497,12 @@
                       consumeanchor="PanelUI-button"
                       data-l10n-id="appmenu-menu-button-closed2"/>
      </toolbaritem>