diff --git a/themes/f5e08afe-490e-41da-bd99-a38abd844921/chrome.css b/themes/f5e08afe-490e-41da-bd99-a38abd844921/chrome.css
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+
+/* ============================================
+   Tab Switch Animations — Zen Browser Mod
+   Author: rmshkmx
+   ============================================ */
+
+/* ─── Speed Presets ─── */
+
+/* Fast (0.15s) */
+:root:has([mod-rmshkmx_tab_switch_anim_speed="fast"]) {
+  --rmshkmx-tab-anim-duration: 0.15s;
+  --rmshkmx-tab-anim-easing-popup: cubic-bezier(0.175, 0.885, 0.3, 1.3);
+  --rmshkmx-tab-anim-easing-slide: cubic-bezier(0.25, 0.46, 0.45, 0.94);
+}
+
+/* Normal (0.25s) — default */
+:root:has([mod-rmshkmx_tab_switch_anim_speed="normal"]),
+:root:not(:has([mod-rmshkmx_tab_switch_anim_speed])) {
+  --rmshkmx-tab-anim-duration: 0.25s;
+  --rmshkmx-tab-anim-easing-popup: cubic-bezier(0.175, 0.885, 0.32, 1.35);
+  --rmshkmx-tab-anim-easing-slide: cubic-bezier(0.25, 0.46, 0.45, 0.94);
+}
+
+/* Slow (0.4s) */
+:root:has([mod-rmshkmx_tab_switch_anim_speed="slow"]) {
+  --rmshkmx-tab-anim-duration: 0.4s;
+  --rmshkmx-tab-anim-easing-popup: cubic-bezier(0.175, 0.885, 0.32, 1.55);
+  --rmshkmx-tab-anim-easing-slide: cubic-bezier(0.22, 0.61, 0.36, 1);
+}
+
+/* Extra Slow (0.6s) */
+:root:has([mod-rmshkmx_tab_switch_anim_speed="extra-slow"]) {
+  --rmshkmx-tab-anim-duration: 0.6s;
+  --rmshkmx-tab-anim-easing-popup: cubic-bezier(0.175, 0.885, 0.32, 1.65);
+  --rmshkmx-tab-anim-easing-slide: cubic-bezier(0.22, 0.61, 0.36, 1);
+}
+
+/* ─── Popup Animation ─── */
+/* New tab zooms in from behind (scale 0.9 → 1.0) with inertia bounce */
+
+#tabbrowser-tabpanels>hbox:not([zen-split="true"]):not(:has(.zen-glance-background)) {
+  @media -moz-pref("mod.rmshkmx.tab_switch_anim_popup") {
+    transition: scale var(--rmshkmx-tab-anim-duration) var(--rmshkmx-tab-anim-easing-popup),
+      opacity var(--rmshkmx-tab-anim-duration) ease-in-out !important;
+    scale: 0.9 !important;
+    opacity: 0;
+  }
+}
+
+#tabbrowser-tabpanels>hbox.deck-selected:not([zen-split="true"]) {
+  @media -moz-pref("mod.rmshkmx.tab_switch_anim_popup") {
+    scale: 1 !important;
+    opacity: 1 !important;
+  }
+}
+
+/* ─── Slide Animation ─── */
+/* Old tab slides up and out, new tab slides in from below */
+
+#tabbrowser-tabpanels>hbox:not([zen-split="true"]):not(:has(.zen-glance-background)) {
+  @media -moz-pref("mod.rmshkmx.tab_switch_anim_slide") {
+    transition: translate var(--rmshkmx-tab-anim-duration) var(--rmshkmx-tab-anim-easing-slide),
+      opacity var(--rmshkmx-tab-anim-duration) ease-in-out !important;
+    translate: 0 -3% !important;
+    opacity: 0;
+  }
+}
+
+#tabbrowser-tabpanels>hbox.deck-selected:not([zen-split="true"]) {
+  @media -moz-pref("mod.rmshkmx.tab_switch_anim_slide") {
+    translate: 0 0 !important;
+    opacity: 1 !important;
+  }
+}
diff --git a/themes/f5e08afe-490e-41da-bd99-a38abd844921/image.png b/themes/f5e08afe-490e-41da-bd99-a38abd844921/image.png
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diff --git a/themes/f5e08afe-490e-41da-bd99-a38abd844921/preferences.json b/themes/f5e08afe-490e-41da-bd99-a38abd844921/preferences.json
new file mode 100644
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+[
+    {
+        "property": "mod.rmshkmx.tab_switch_anim_popup",
+        "label": "\ud83c\udfac Enable Popup Animation (zoom-in with inertia)",
+        "type": "checkbox",
+        "defaultValue": true
+    },
+    {
+        "property": "mod.rmshkmx.tab_switch_anim_slide",
+        "label": "\ud83c\udfac Enable Slide Animation (vertical slide)",
+        "type": "checkbox",
+        "defaultValue": false
+    },
+    {
+        "property": "mod.rmshkmx.tab_switch_anim_speed",
+        "label": "\u26a1 Animation Speed",
+        "type": "dropdown",
+        "options": [
+            {
+                "label": "Fast (0.15s)",
+                "value": "fast"
+            },
+            {
+                "label": "Normal (0.25s)",
+                "value": "normal"
+            },
+            {
+                "label": "Slow (0.4s)",
+                "value": "slow"
+            },
+            {
+                "label": "Extra Slow (0.6s)",
+                "value": "extra-slow"
+            }
+        ]
+    }
+]
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diff --git a/themes/f5e08afe-490e-41da-bd99-a38abd844921/readme.md b/themes/f5e08afe-490e-41da-bd99-a38abd844921/readme.md
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+
+# Tab Switch Animations
+
+A Zen Browser mod that adds smooth animations when switching between tabs.
+
+## Features
+
+### 🎬 Two Animation Types
+
+- **Popup** — The new tab zooms in from the background with a smooth inertia bounce effect (scale 0.9 → 1.0). Inspired by the Transparent Zen mod's animation style.
+- **Slide** — The old tab slides up and fades out while the new tab slides in from below.
+
+### ⚡ Adjustable Speed
+
+Choose from 4 speed presets in the mod settings:
+
+| Preset | Duration | Feel |
+|--------|----------|------|
+| Fast | 0.15s | Snappy, minimal animation |
+| Normal | 0.25s | Balanced (default) |
+| Slow | 0.4s | Smooth and noticeable |
+| Extra Slow | 0.6s | Dramatic, cinematic |
+
+## Settings
+
+After installing the mod, go to **Zen Settings → Mods → Tab Switch Animations** to configure:
+
+1. **Enable Popup Animation** — Toggle the zoom-in popup effect
+2. **Enable Slide Animation** — Toggle the vertical slide effect
+3. **Animation Speed** — Choose your preferred speed preset
+
+> **Note:** You can enable only one animation at a time. If both are enabled, both effects will apply simultaneously (not recommended).
+
+## Compatibility
+
+- Works with Zen Browser's split view (animations are disabled for split tabs)
+- Compatible with Zen Glance
+- Does not conflict with other animation mods (but using multiple tab animation mods is not recommended)
+
+## Installation
+
+Install directly from the [Zen Mods page](https://zen-browser.app/mods) by searching for "Tab Switch Anim".
+
+## Author
+
+Made by [rmshkmx](https://github.com/rmshkmx)
diff --git a/themes/f5e08afe-490e-41da-bd99-a38abd844921/theme.json b/themes/f5e08afe-490e-41da-bd99-a38abd844921/theme.json
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+++ b/themes/f5e08afe-490e-41da-bd99-a38abd844921/theme.json
@@ -0,0 +1,15 @@
+{
+    "id": "f5e08afe-490e-41da-bd99-a38abd844921",
+    "name": "Tab Switch Anim",
+    "description": "Popup & Slide tab switch animations with speed control",
+    "homepage": "https://github.com/rmshkmx/NewSwitchAnims",
+    "style": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/f5e08afe-490e-41da-bd99-a38abd844921/chrome.css",
+    "readme": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/f5e08afe-490e-41da-bd99-a38abd844921/readme.md",
+    "image": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/f5e08afe-490e-41da-bd99-a38abd844921/image.png",
+    "author": "rmshkmx",
+    "version": "1.0.0",
+    "tags": [],
+    "createdAt": "2026-07-03",
+    "updatedAt": "2026-07-03",
+    "preferences": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/f5e08afe-490e-41da-bd99-a38abd844921/preferences.json"
+}
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