diff --git a/chrome/classic_firefox_menu_button.css b/chrome/classic_firefox_menu_button.css
index ae66dcb..f14e0ec 100644
--- a/chrome/classic_firefox_menu_button.css
+++ b/chrome/classic_firefox_menu_button.css
@@ -17,7 +17,7 @@ See the above repository for updates as well as full license text. */
   order: -1;
   margin-inline: 2px var(--uc-window-drag-space-pre,24px) !important;
 }
-:root[tabsintitlebar] #nav-bar{
+:root:is([tabsintitlebar],[customtitlebar]) #nav-bar{
   border-left-width: 0px;
   padding-left: 0px !important;
 }
diff --git a/chrome/click_selected_tab_to_focus_urlbar.css b/chrome/click_selected_tab_to_focus_urlbar.css
index f58151d..7adb053 100644
--- a/chrome/click_selected_tab_to_focus_urlbar.css
+++ b/chrome/click_selected_tab_to_focus_urlbar.css
@@ -49,7 +49,7 @@ See the above repository for updates as well as full license text. */
   content: "";
   pointer-events: auto;
 }
-:root[tabsintitlebar]:not([customizing]) .urlbar-input-container::before{
+:root:is([tabsintitlebar],[customtitlebar]):not([customizing]) .urlbar-input-container::before{
   left: var(--uc-window-drag-space-width);
   width: calc(100vw - var(--uc-window-control-width) - var(--uc-buttons-width) - 2 * var(--uc-window-drag-space-width));
 }
@@ -61,7 +61,7 @@ See the above repository for updates as well as full license text. */
   z-index: 1;
   pointer-events: none
 }
-:root[tabsintitlebar] .browser-titlebar,
+:root:is([tabsintitlebar],[customtitlebar]) .browser-titlebar,
 #titlebar{
   opacity: 1 !important;
   will-change: unset !important;
diff --git a/chrome/hide_tabs_toolbar_v2.css b/chrome/hide_tabs_toolbar_v2.css
index b2c5c18..0a40b81 100644
--- a/chrome/hide_tabs_toolbar_v2.css
+++ b/chrome/hide_tabs_toolbar_v2.css
@@ -23,7 +23,7 @@ See the above repository for updates as well as full license text. */
   :root[sizemode="fullscreen"] #nav-bar > .titlebar-buttonbox-container{
     display: flex !important;
   }
-  :root[tabsintitlebar] #toolbar-menubar:not([autohide="false"]) ~ #nav-bar{
+  :root:is([tabsintitlebar],[customtitlebar]) #toolbar-menubar:not([autohide="false"]) ~ #nav-bar{
     > .titlebar-buttonbox-container{
       display: flex !important;
     }
diff --git a/chrome/menubar_in_main_toolbar.css b/chrome/menubar_in_main_toolbar.css
index a5cd887..0a75b0b 100644
--- a/chrome/menubar_in_main_toolbar.css
+++ b/chrome/menubar_in_main_toolbar.css
@@ -29,5 +29,5 @@ See the above repository for updates as well as full license text. */
 #nav-bar{ padding-left: 300px; }
 
 #toolbar-menubar > .titlebar-buttonbox-container{ display: none }
-:root[tabsintitlebar][sizemode="normal"] .titlebar-spacer,
-:root[tabsintitlebar] #TabsToolbar > .titlebar-buttonbox-container{ display: flex !important; }
+:root:is([tabsintitlebar],[customtitlebar])[sizemode="normal"] .titlebar-spacer,
+:root:is([tabsintitlebar],[customtitlebar]) #TabsToolbar > .titlebar-buttonbox-container{ display: flex !important; }
diff --git a/chrome/oneline_toolbar.css b/chrome/oneline_toolbar.css
index c85b7ca..349ff45 100644
--- a/chrome/oneline_toolbar.css
+++ b/chrome/oneline_toolbar.css
@@ -58,7 +58,7 @@ See the above repository for updates as well as full license text. */
         :root[sizemode="fullscreen"] #nav-bar > .titlebar-buttonbox-container{
           display: flex !important;
         }
-        :root[tabsintitlebar] :where(#toolbar-menubar:not([autohide="false"])){
+        :root:is([tabsintitlebar],[customtitlebar]) :where(#toolbar-menubar:not([autohide="false"])){
           + #TabsToolbar{
             :root[sizemode="normal"] & {
               > .titlebar-spacer[type="post-tabs"]{
@@ -78,7 +78,7 @@ See the above repository for updates as well as full license text. */
         :root[sizemode="fullscreen"] #TabsToolbar > .titlebar-buttonbox-container{
           display: flex !important;
         }
-        :root[tabsintitlebar] :where(#toolbar-menubar:not([autohide="false"])){
+        :root:is([tabsintitlebar],[customtitlebar]) :where(#toolbar-menubar:not([autohide="false"])){
           + #TabsToolbar > :is(.titlebar-buttonbox-container,.titlebar-spacer[type="post-tabs"]){
             display: flex !important;
           }
@@ -99,7 +99,7 @@ See the above repository for updates as well as full license text. */
         :root[sizemode="fullscreen"] #TabsToolbar > .titlebar-buttonbox-container{
           display: flex !important;
         }
-        :root[tabsintitlebar] :where(#toolbar-menubar:not([autohide="false"])){
+        :root:is([tabsintitlebar],[customtitlebar]) :where(#toolbar-menubar:not([autohide="false"])){
           + #TabsToolbar > :is(.titlebar-buttonbox-container,.titlebar-spacer[type="pre-tabs"]){
             display: flex !important;
           }
@@ -117,7 +117,7 @@ See the above repository for updates as well as full license text. */
         :root[sizemode="fullscreen"] #nav-bar > .titlebar-buttonbox-container{
           display: flex !important;
         }
-        :root[tabsintitlebar] :where(#toolbar-menubar:not([autohide="false"])){
+        :root:is([tabsintitlebar],[customtitlebar]) :where(#toolbar-menubar:not([autohide="false"])){
           :root[sizemode="normal"] & {
             + #TabsToolbar > .titlebar-spacer[type="pre-tabs"]{
               display: flex !important;
diff --git a/chrome/selected_tab_as_urlbar.css b/chrome/selected_tab_as_urlbar.css
index 8b6c317..18ce513 100644
--- a/chrome/selected_tab_as_urlbar.css
+++ b/chrome/selected_tab_as_urlbar.css
@@ -113,6 +113,6 @@ See the above repository for updates as well as full license text. */
   background-color: transparent !important;
 }
 
-:root[tabsintitlebar] #titlebar:has(> [autohide="false"]) + #nav-bar{
+:root:is([tabsintitlebar],[customtitlebar]) #titlebar:has(> [autohide="false"]) + #nav-bar{
   border-inline-width: 0 !important;
 }
diff --git a/chrome/tabs_below_content_v2.css b/chrome/tabs_below_content_v2.css
index d5f1ca0..70fda08 100644
--- a/chrome/tabs_below_content_v2.css
+++ b/chrome/tabs_below_content_v2.css
@@ -39,7 +39,7 @@ See the above repository for updates as well as full license text. */
   :root[sizemode="fullscreen"] #nav-bar > .titlebar-buttonbox-container{
     display: flex !important;
   }
-  :root[tabsintitlebar] #toolbar-menubar:not([autohide="false"]) ~ #nav-bar{
+  :root:is([tabsintitlebar],[customtitlebar]) #toolbar-menubar:not([autohide="false"]) ~ #nav-bar{
      > .titlebar-buttonbox-container{
       display: flex !important;
     }
diff --git a/chrome/tabs_on_bottom_v2.css b/chrome/tabs_on_bottom_v2.css
index 77fec5c..dd57762 100644
--- a/chrome/tabs_on_bottom_v2.css
+++ b/chrome/tabs_on_bottom_v2.css
@@ -23,7 +23,7 @@ See the above repository for updates as well as full license text. */
   :root[sizemode="fullscreen"] #nav-bar > .titlebar-buttonbox-container{
     display: flex !important;
   }
-  :root[tabsintitlebar] #toolbar-menubar:not([autohide="false"]) ~ #nav-bar{
+  :root:is([tabsintitlebar],[customtitlebar]) #toolbar-menubar:not([autohide="false"]) ~ #nav-bar{
     > .titlebar-buttonbox-container{
       display: flex !important;
     }