diff --git a/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/chrome.css b/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/chrome.css
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+
+/* ========== Window Buttons Styles ========== */
+
+/* Adjust top margin for sidebar top buttons when using right-side layout */
+    #navigator-toolbox[zen-right-side="true"] > #zen-sidebar-top-buttons > .titlebar-buttonbox-container > .titlebar-buttonbox {
+        margin-top: 11px !important;
+    }
+
+/* Set right margin for the button container */
+    .titlebar-buttonbox {
+        margin-right: 20px;
+    }
+
+/* Base styling for titlebar buttons */
+    .titlebar-button {
+        padding: 0px !important;
+        min-height: 13px !important;
+        min-width: 13px !important;
+        height: 13px !important;
+        align-self: center;
+        margin-left: 5px !important;
+        border-radius: 50px;
+        transition: all 100ms;
+    }
+
+/* Background colors for individual window buttons */
+    .titlebar-min {
+        background-color: hsl(130, 50%, 40%) !important;
+    }
+    .titlebar-max, .titlebar-restore {
+        background-color: hsl(60, 50%, 50%) !important;
+    }
+    .titlebar-close {
+        background-color: hsl(0, 50%, 50%) !important;
+    }
+
+/* Hide images inside titlebar buttons */
+    .titlebar-button > image {
+        visibility: collapse !important;
+    }
+
+/* ========== macOS-style Hover Effect ========== */
+    @media (-moz-bool-pref: "theme.zen-minimal-exit-menu.enable-macos-identic") {
+        .titlebar-button:hover {
+            opacity: 0.25 !important;
+        }
+    }
+
+/* ========== Default Styling for Non-macOS Mode ========== */
+    @media not (-moz-bool-pref: "theme.zen-minimal-exit-menu.enable-macos-identic") {
+        .titlebar-button {
+            background-color: var(--zen-colors-border) !important;
+        }
+        .titlebar-min:hover {
+            background-color: hsl(130, 50%, 40%) !important;
+        }
+        .titlebar-max:hover, .titlebar-restore:hover {
+            background-color: hsl(60, 50%, 50%) !important;
+        }
+        .titlebar-close:hover {
+            background-color: hsl(0, 50%, 50%) !important;
+        }
+        .titlebar-button:hover {
+            min-height: 20px !important;
+        }
+    }
+
+/* ========== Navigator Toolbox and Titlebar Base Styles ========== */
+
+/* Set toolbox position and stacking order */
+    #navigator-toolbox {
+        position: relative !important;
+        z-index: 10 !important;
+    }
+
+/* Basic styling for the titlebar (sidebar container) */
+    #titlebar {
+        width: var(--zen-toolbox-max-width, 44px) !important; /* Default width is 44px */
+        transition: width var(--theme-sidebar_expand_on_hover-transition_speed, 120ms) cubic-bezier(.24, -0.01, .58, 1) !important;
+        overflow: hidden !important;
+        border-radius: 8px !important;
+        background-color: var(--zen-main-browser-background-toolbar, transparent) !important;
+        z-index: 1000 !important; /* Ensure titlebar is on top */
+    }
+
+/* ========== Collapsed Sidebar Mode Styles ========== */
+    :root:has(#navigator-toolbox:not([zen-sidebar-expanded="true"])) {
+        --zen-toolbox-max-width: 44px !important;
+        --tab-collapsed-width: var(--zen-toolbox-max-width) !important;
+
+/* Vertical tabs container styling in collapsed mode */
+        #tabbrowser-tabs[orient="vertical"] {
+            display: flex;
+            flex-direction: column;
+            overflow: hidden;
+            max-width: 100%;
+        }
+
+/* Tab styling for collapsed mode */
+        .tabbrowser-tab {
+            width: var(--zen-toolbox-max-width) !important;
+            margin: 0 !important;
+            /* Center the content within tabs */
+            .tab-content {
+                justify-content: center !important;
+                align-items: center !important;
+            }
+            .tab-icon-stack {
+                margin: 0 auto !important;
+            }
+            /* Hide tab labels when collapsed */
+            .tab-label-container {
+                display: none !important;
+            }
+        }
+
+/* Transition effect for the new tab button */
+        #tabs-newtab-button {
+            transition: width 120ms cubic-bezier(.24, -0.01, .58, 1) !important;
+        }
+
+/* ========== Sidebar Background in Collapsed Mode ========== */
+        @media not (-moz-bool-pref: "theme.sidebar_expand_on_hover.custom_background") {
+            #titlebar::before {
+                position: absolute;
+                content: "";
+                width: 100%;
+                height: 100%;
+                opacity: 0.0;
+                transition: 60ms opacity ease-in calc(var(--theme-sidebar_expand_on_hover-transition_speed, 120ms) - 60ms);
+                z-index: -1;
+                background: var(--zen-main-browser-background-toolbar) !important;
+                background-attachment: fixed !important;
+                background-size: 2000px !important;
+                backdrop-filter: blur(5px) !important;
+                border-top-right-radius: 8px !important;
+                border-bottom-right-radius: 8px !important;
+            }
+        }
+    }
+
+/* ========== Expanded Sidebar on Hover Styles ========== */
+    #navigator-toolbox #titlebar:hover {
+        width: var(--theme-sidebar_expand_on_hover-expanded_width, 300px) !important;
+        box-shadow: 0 0 1px rgba(0, 0, 0, 0.7);
+        background-color: var(--zen-main-browser-background-toolbar, transparent) !important;
+
+/* Reveal background when hovering */
+        &::before {
+            opacity: 1.0 !important;
+            transition: 60ms opacity ease-out;
+        }
+
+/* Expand new tab button within the titlebar on hover */
+        #titlebar:hover #tabs-newtab-button {
+            width: 100% !important; /* Button takes full width */
+            justify-content: flex-start !important;
+        }
+
+/* ========== Expanded Tabs Styles ========== */
+        .tabbrowser-tab {
+            width: 100% !important;
+            transition: all var(--theme-sidebar_expand_on_hover-transition_speed, 120ms) !important;
+            .tab-content {
+                justify-content: flex-start !important;
+                padding: 0 var(--tab-inline-padding) !important;
+                gap: var(--tab-inline-padding);
+                width: 100% !important;
+                align-items: center !important;
+                transition: all var(--theme-sidebar_expand_on_hover-transition_speed, 120ms) !important;
+            }
+            .tab-icon-stack {
+                margin: 0 !important;
+            }
+            /* Show tab labels in expanded mode */
+            .tab-label-container {
+                display: flex !important;
+                opacity: 1 !important;
+                visibility: visible !important;
+                max-width: calc(var(--theme-sidebar_expand_on_hover-expanded_width, 300px) - 60px) !important;
+                transition: opacity var(--theme-sidebar_expand_on_hover-transition_speed, 120ms) ease-in-out !important;
+            }
+            /* Animate active tab background */
+            .tab-background {
+                transition: all var(--theme-sidebar_expand_on_hover-transition_speed, 120ms) cubic-bezier(.24, -0.01, .58, 1) !important;
+                width: 100% !important;
+            }
+            &[visuallyselected="true"] .tab-background {
+                width: 100% !important;
+            }
+        }
+
+/* Display close buttons on tabs when hovered or active */
+        .tabbrowser-tab:not([pinned]):hover .tab-close-button,
+        .tabbrowser-tab[visuallyselected]:not([pinned]) .tab-close-button {
+            display: block !important;
+            opacity: 1 !important;
+        }
+    }
+
+/* ========== Tab Highlight Adjustments in Collapsed Mode ========== */
+    :root:has(#navigator-toolbox:not([zen-sidebar-expanded="true"])) {
+        .tabbrowser-tab[visuallyselected="true"] .tab-background {
+            width: calc(100% - 4px) !important;
+            margin: 0 auto !important;
+            border-radius: var(--border-radius-medium) !important;
+        }
+        @media not (-moz-bool-pref: "theme.sidebar_expand_on_hover.default_tab_background_shape") {
+            .tabbrowser-tab .tab-background {
+                border-radius: var(--border-radius-medium) !important;
+                width: calc(100% - 4px) !important;
+                margin: 0 auto !important;
+            }
+        }
+        /* Animate tab selection across various states */
+        #titlebar:hover .tabbrowser-tab .tab-background,
+        #navigator-toolbox[zen-has-hover] .tabbrowser-tab .tab-background,
+        #navigator-toolbox[has-popup-menu] .tabbrowser-tab .tab-background,
+        #navigator-toolbox[movingtab] .tabbrowser-tab .tab-background {
+            width: 100% !important;
+            transform: none !important;
+            border-radius: var(--border-radius-medium) 0 0 var(--border-radius-medium) !important;
+            transition: all var(--theme-sidebar_expand_on_hover-transition_speed, 120ms) cubic-bezier(.24, -0.01, .58, 1) !important;
+        }
+    }
+}
diff --git a/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/image.png b/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/image.png
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diff --git a/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/preferences.json b/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/preferences.json
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+[
+    {
+        "property": "theme.sidebar_expand_on_hover.expanded_width",
+        "label": "Width of the expanded sidebar",
+        "type": "string",
+        "defaultValue": "300px"
+    },
+    {
+        "property": "theme.sidebar_expand_on_hover.transition_speed",
+        "label": "Transition speed of the sidebar",
+        "type": "string",
+        "defaultValue": "120ms"
+    },
+    {
+        "property": "theme.sidebar_expand_on_hover.default_tab_background_shape",
+        "label": "Default Tab Background Shape",
+        "type": "checkbox",
+        "defaultValue": false
+    },
+    {
+        "property": "theme.sidebar_expand_on_hover.collapse_buttons",
+        "label": "Collapse the buttons to only show current workspace",
+        "type": "checkbox",
+        "defaultValue": true
+    },
+    {
+        "property": "theme.sidebar_expand_on_hover.hide_workspace_indicator",
+        "label": "Hide top workspace indicator",
+        "type": "checkbox",
+        "defaultValue": true
+    },
+    {
+        "property": "theme.sidebar_expand_on_hover.custom_background",
+        "label": "My theme overwrites the #TabsToolbar background (e.g. catppuccin)",
+        "type": "checkbox",
+        "defaultValue": false
+    },
+    {
+        "property": "theme.sidebar_expand_on_hover.inverted_tabs",
+        "label": "Inverted Tab Direction",
+        "type": "checkbox",
+        "defaultValue": false
+    },
+    {
+        "property": "theme.zen-minimal-exit-menu.enable-macos-identic",
+        "label": "Enable macOS identical window buttons",
+        "type": "checkbox",
+        "defaultValue": false
+    }
+]
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diff --git a/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/readme.md b/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/readme.md
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@@ -0,0 +1,5 @@
+
+# SidebarHover
+
+## Description
+SidebarHover is a sleek mod for Zen Browser that introduces a dynamic sidebar which expands gracefully on hover. With customizable options for transition speed, expanded width, SidebarHover delivers both elegance and enhanced functionality. Its modular design allows users to tailor the experience to their needs, even offering a macOS-style window button option. Embrace a more refined browsing experience where efficiency meets style in a seamless, intuitive interfa
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diff --git a/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/theme.json b/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/theme.json
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--- /dev/null
+++ b/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/theme.json
@@ -0,0 +1,15 @@
+{
+    "id": "0f636079-ac59-4830-849e-dbf165ed7ad0",
+    "name": "SidebarHover",
+    "description": "Expanding sidebar on hover with customizable speed and width",
+    "homepage": "https://github.com/Waltorvi/ZenMods/tree/master/SidebarHover",
+    "style": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/chrome.css",
+    "readme": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/readme.md",
+    "image": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/image.png",
+    "author": "Waltorvi",
+    "version": "1.0.0",
+    "tags": [],
+    "createdAt": "2025-03-17",
+    "updatedAt": "2025-03-17",
+    "preferences": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/0f636079-ac59-4830-849e-dbf165ed7ad0/preferences.json"
+}
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