diff --git a/__tests__/os.test.scss b/__tests__/os.test.scss
index 946aee8..a9794bc 100644
--- a/__tests__/os.test.scss
+++ b/__tests__/os.test.scss
@@ -17,7 +17,7 @@
         }
       }
       @include expect {
-        @media (-moz-os-version: windows-win7) {
+        @media (-moz-os-version: windows-win7), (-moz-platform: windows-win7) {
           @include example;
         }
       }
@@ -32,7 +32,7 @@
         }
       }
       @include expect {
-        @media (-moz-os-version: windows-win8) {
+        @media (-moz-os-version: windows-win8), (-moz-platform: windows-win8) {
           @include example;
         }
       }
@@ -47,7 +47,7 @@
         }
       }
       @include expect {
-        @media (-moz-os-version: windows-win10) {
+        @media (-moz-os-version: windows-win10), (-moz-platform: windows-win10) {
           @include example;
         }
       }
@@ -107,7 +107,7 @@
         }
       }
       @include expect {
-        @media (-moz-os-version: windows-win7), (-moz-os-version: windows-win8), (-moz-os-version: windows-win10) {
+        @media (-moz-os-version: windows-win7), (-moz-platform: windows-win7), (-moz-os-version: windows-win8), (-moz-platform: windows-win8), (-moz-os-version: windows-win10), (-moz-platform: windows-win10) {
           @include example;
         }
       }
@@ -122,7 +122,7 @@
         }
       }
       @include expect {
-        @media (-moz-os-version: windows-win7), (-moz-os-version: windows-win8), (-moz-os-version: windows-win10), (-moz-mac-big-sur-theme: 0), (-moz-gtk-csd-available) {
+        @media (-moz-os-version: windows-win7), (-moz-platform: windows-win7), (-moz-os-version: windows-win8), (-moz-platform: windows-win8), (-moz-os-version: windows-win10), (-moz-platform: windows-win10), (-moz-mac-big-sur-theme: 0), (-moz-gtk-csd-available) {
           @include example;
         }
         @supports -moz-bool-pref("layout.css.osx-font-smoothing.enabled") {
@@ -140,7 +140,7 @@
         }
       }
       @include expect {
-        @media (-moz-mac-big-sur-theme: 0), (-moz-gtk-csd-available), (-moz-os-version: windows-win7), (-moz-os-version: windows-win8), (-moz-os-version: windows-win10) {
+        @media (-moz-mac-big-sur-theme: 0), (-moz-gtk-csd-available), (-moz-os-version: windows-win7), (-moz-platform: windows-win7), (-moz-os-version: windows-win8), (-moz-platform: windows-win8), (-moz-os-version: windows-win10), (-moz-platform: windows-win10) {
           @include example;
         }
         @supports -moz-bool-pref("layout.css.osx-font-smoothing.enabled") {
diff --git a/src/decoration/_animate.scss b/src/decoration/_animate.scss
index 26e6ebe..1eef780 100644
--- a/src/decoration/_animate.scss
+++ b/src/decoration/_animate.scss
@@ -119,6 +119,32 @@ xul|search-textbox.tabsFilter:hover,
   transition-delay: 0s, 0s, 0.25s !important;
 }
 
+/*- Full Screen ------------------------------------------------------------*/
+#navigator-toolbox {
+  /* Full screen out */
+  transition: margin-top 1s ease;
+}
+#navigator-toolbox[inFullscreen="true"] {
+  /* Full screen enter */
+  animation-duration: 1s;
+  animation-name: fullscreen;
+  animation-timing-function: ease;
+
+  /* Full screen navbar not hover */
+  transition: margin-top 0.3s var(--animation-easing-function) 50ms;
+}
+#navigator-toolbox[inFullscreen="true"]:hover {
+  transition-duration: 1.5s;
+  transition-delay: 0.1s;
+}
+
+@keyframes fullscreen {
+  from {
+    margin-top: 0;
+  }
+  /* Dont' use `to`: Depending on density */
+}
+
 /*- Expand - Synced Tabs ---------------------------------------------------*/
 @-moz-document url("chrome://browser/content/syncedtabs/sidebar.xhtml")
 {
diff --git a/src/padding/_tabbar_height.scss b/src/padding/_tabbar_height.scss
index 32342b8..421503c 100644
--- a/src/padding/_tabbar_height.scss
+++ b/src/padding/_tabbar_height.scss
@@ -1,4 +1,32 @@
 /* Toolbar Height */
+@include Option($tabLeptonLikePadding) {
+  :root:not([uidensity]) #TabsToolbar {
+    --tab-min-height: 36px;
+  }
+  :root[uidensity="compact"] #TabsToolbar {
+    --tab-min-height: 32px;
+  }
+  :root[uidensity="touch"] #TabsToolbar {
+    --tab-min-height: 41px;
+  }
+}
+@include Option($tabPhotonLikePadding) {
+  :root:not([uidensity]) #TabsToolbar {
+    --tab-min-height: 32px;
+  }
+  :root[uidensity="compact"] #TabsToolbar {
+    --tab-min-height: 29px;
+  }
+  :root[uidensity="touch"] #TabsToolbar {
+    --tab-min-height: 41px;
+  }
+
+  /* Top Margin */
+  .tab-background,
+  .tab-content {
+    margin-top: 0 !important;
+  }
+}
 @include NotOption($tabPhotonLikePadding) {
   :root:not([uidensity]) #TabsToolbar {
     --tab-min-height: 36px !important; /* 38px -> 36px */
@@ -8,34 +36,18 @@
   }
 }
 @include NotOption($tabProtonLikePadding) {
-  #tabbrowser-arrowscrollbox {
-    max-height: calc(var(--tabbar-max-height, 38px) + var(--space-above-tabbar));
-  }
-  :root[uidensity="touch"] #tabbrowser-arrowscrollbox {
-    --tabbar-max-height: 45px;
-  }
-}
-
-@include Option($tabLeptonLikePadding) {
-  #tabbrowser-arrowscrollbox {
-    --tabbar-max-height: 38px;
-  }
-  :root[uidensity="compact"] #tabbrowser-arrowscrollbox {
-    --tabbar-max-height: 32px;
-  }
-}
-@include Option($tabPhotonLikePadding) {
-  #tabbrowser-arrowscrollbox {
-    --tabbar-max-height: 33px;
-  }
-  :root[uidensity="compact"] #tabbrowser-arrowscrollbox {
-    --tabbar-max-height: 29px;
+  #TabsToolbar {
+    --toolbarbutton-inner-padding: calc((var(--tab-min-height) - 18px) / 2) !important; /* Prevent overflow pinned tab bottom margin */
   }
 
-  /* Top Margin */
-  .tab-background,
-  .tab-content {
-    margin-top: 0 !important;
+  :root:not([uidensity="compact"]) #tabbrowser-arrowscrollbox,
+  #tabbrowser-arrowscrollbox[overflowing="true"] > .tabbrowser-tab[pinned="true"],
+  #tabbrowser-arrowscrollbox[overflowing="true"] > .tabbrowser-tab[pinned="true"] .tab-stack,
+  #tabbrowser-arrowscrollbox[overflowing="true"] > .tabbrowser-tab[pinned="true"] .tab-content {
+    max-height: var(--tab-min-height) !important; /* Force apply height */
+  }
+  :root[uidensity="compact"] #tabbrowser-arrowscrollbox {
+    height: var(--tab-min-height) !important;
   }
 }
 
diff --git a/src/tabbar/_connect_to_window.scss b/src/tabbar/_connect_to_window.scss
index 7db8cd3..f55dab3 100644
--- a/src/tabbar/_connect_to_window.scss
+++ b/src/tabbar/_connect_to_window.scss
@@ -16,6 +16,6 @@
 #tabbrowser-tabs {
   z-index: 1 !important;
 }
-#tabbrowser-arrowscrollbox[overflowing] .tabbrowser-tab[pinned]:is([visuallyselected], [multiselected]) {
-  overflow: hidden;
+#TabsToolbar {
+  overflow: hidden;   /* Prevent toolbar area over */
 }
diff --git a/src/theme/_built_in.scss b/src/theme/_built_in.scss
index d6d7f4d..a994c92 100644
--- a/src/theme/_built_in.scss
+++ b/src/theme/_built_in.scss
@@ -1,3 +1,5 @@
+// lwtheme-mozlightdark: Legacy - v96
+
 /*= Lightmode - Color darker =================================================*/
 :root[lwtheme-mozlightdark]:not([lwthemetextcolor="bright"]), /* Legacy */
 :root[style*="--lwt-accent-color: rgb(240, 240, 244); --lwt-text-color: rgba(21, 20, 26);"] {
diff --git a/src/utils/_os.scss b/src/utils/_os.scss
index 27895ed..8b26164 100644
--- a/src/utils/_os.scss
+++ b/src/utils/_os.scss
@@ -14,12 +14,23 @@ $win10:  "win10";
 $bigsur: "bigsur";
 
 //== Privated Variables ========================================================
-$_win-template: "-moz-os-version: windows-";
+$_win-template: "-moz-os-version: windows-" "-moz-platform: windows-";
 $_win-media: (
-  #{$win7}: $_win-template + "win7",
-  #{$win8}: $_win-template + "win8",
-  #{$win10}: $_win-template + "win10",
+  #{$win7}:  "win7",
+  #{$win8}:  "win8",
+  #{$win10}: "win10",
 );
+@each $_win-key in map.keys($_win-media) {
+  $_win-value: map.get($_win-media, $_win-key);
+
+  $result-template: ();
+  @for $i from 1 through list.length($_win-template) {
+    $result-value: list.nth($_win-template, $i) + $_win-value;
+    $result-template: list.append($result-template, $result-value);
+  }
+  $_win-media: map.set($_win-media, $_win-key, $result-template);
+}
+
 $_others-media: (
   #{$linux}: "-moz-gtk-csd-available",
   #{$bigsur}: "-moz-mac-big-sur-theme: 0",
@@ -39,7 +50,7 @@ $_os-media: map.merge(
   @each $osName in $osNames {
     $osMedia: map.get($_os-media, $osName);
     @if $osMedia != null {
-      $osMedias: list.append($osMedias, $osMedia);
+      $osMedias: list.join($osMedias, $osMedia);
     }
   }