Add theme: Adjust Tab Height

themes/bbfb0dc1-0b26-4a0b-84a5-0722fd20c909/chrome.css

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+
+{
+    --tab-block-margin: calc(var(--mod-adjust_tab_height-tab_height)*1px) !important;
+}

themes/bbfb0dc1-0b26-4a0b-84a5-0722fd20c909/preferences.json

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+[
+    {
+        "property": "property",
+        "label": "mod.adjust_tab_height.tab_height",
+        "type": "checkbox",
+        "disabledOn": []
+    },
+    {
+        "property": "label",
+        "label": "Tab Height (Pixels)",
+        "type": "checkbox",
+        "disabledOn": []
+    },
+    {
+        "property": "type",
+        "label": "string",
+        "type": "checkbox",
+        "disabledOn": []
+    },
+    {
+        "property": "placeholder",
+        "label": "4",
+        "type": "checkbox",
+        "disabledOn": []
+    },
+    {
+        "property": "defaultValue",
+        "label": "4",
+        "type": "checkbox",
+        "disabledOn": []
+    }
+]

themes/bbfb0dc1-0b26-4a0b-84a5-0722fd20c909/readme.md

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+
+# Adjust Tab Height
+Adjusts tab height by modifying the margin in between tabs. 
+* Has one property, where you specify the number of pixels for the margin to be.
+  * The browser default is 4 pixels.
+  * If you want the tabs to be closer together, you can specify negative numbers. Some things start to break past around -6, but this is not thoroughly tested so there could be other issues.
+  * Decimals seem to work fine, although I don't know if they're real or being rounded.
+  * Input only the desired number of pixels as a number, do not include a unit.
+* This has not been thoroughly tested. It works on my computer, on Windows, with the mods I have and the other css modifications I have (which are minimal). Just making this for my girlfriend so it's easier for her to use and thought others could benefit from it too :)
+Left: Original. Right: Reduced tab height by a few pixels.
+
+![Shorter Tabs](images/shorter-tabs.png)

themes/bbfb0dc1-0b26-4a0b-84a5-0722fd20c909/theme.json

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+{
+    "id": "bbfb0dc1-0b26-4a0b-84a5-0722fd20c909",
+    "name": "Adjust Tab Height",
+    "description": "A simple zen mod for adjusting the height of tabs in the sidebar. Made for Katrielle!",
+    "homepage": "https://github.com/adorablue/Zen-Mod-Adjust-Tab-Height",
+    "style": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/bbfb0dc1-0b26-4a0b-84a5-0722fd20c909/chrome.css",
+    "readme": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/bbfb0dc1-0b26-4a0b-84a5-0722fd20c909/readme.md",
+    "image": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/bbfb0dc1-0b26-4a0b-84a5-0722fd20c909/image.png",
+    "author": "adorablue",
+    "version": "1.0.0",
+    "tags": [],
+    "createdAt": "2026-01-03",
+    "updatedAt": "2026-01-03",
+    "preferences": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/bbfb0dc1-0b26-4a0b-84a5-0722fd20c909/preferences.json"
+}