Add theme: Vertical Tab Groups

themes/4c2bec61-7f6c-4e5c-bdc6-c9ad1aba1827/chrome.css

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+
+tab-group[split-view-group] {
+    flex-direction: column;
+    padding: 2px 2px !important;
+    position: relative;
+
+&::after {
+        content: '';
+        width: 1px;
+        height: calc(100% - 8px);
+        background-color: light-dark(rgba(0, 0, 0, 0.1), rgba(255, 255, 255, 0.2));
+        position: absolute;
+        right: 0;
+        top: 50%;
+        transform: translateY(-50%);
+    }
+
+&:hover, &:has(> tab:is([visuallyselected], [multiselected])){
+        &::after{
+            width: 0;
+        }
+    }
+}
+
+tab-group[split-view-group] {
+    & > .tabbrowser-tab {
+        &:not(:last-child)::after {
+            width: 0 !important;
+            height: 0 !important;
+        }
+    }
+}

themes/4c2bec61-7f6c-4e5c-bdc6-c9ad1aba1827/readme.md

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+
+# Vertical Tab Groups
+
+Display tab groups vertically so you can still read the page names.

themes/4c2bec61-7f6c-4e5c-bdc6-c9ad1aba1827/theme.json

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+{
+    "id": "4c2bec61-7f6c-4e5c-bdc6-c9ad1aba1827",
+    "name": "Vertical Tab Groups",
+    "description": "Display tab groups vertically so you can still read the page names",
+    "homepage": "https://github.com/ToBinio/zen-mods/tree/main/vertical-tab-groups",
+    "style": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/4c2bec61-7f6c-4e5c-bdc6-c9ad1aba1827/chrome.css",
+    "readme": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/4c2bec61-7f6c-4e5c-bdc6-c9ad1aba1827/readme.md",
+    "image": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/4c2bec61-7f6c-4e5c-bdc6-c9ad1aba1827/image.png",
+    "author": "ToBinio",
+    "version": "1.0.0",
+    "tags": [],
+    "createdAt": "2025-03-11",
+    "updatedAt": "2025-03-11"
+}