Add theme: Borderless Compact Mode

themes/8d6ee23e-a67a-4799-b7cc-23dad0325126/chrome.css

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+
+@media (-moz-bool-pref: "mod.kian1991.enable") {
+  /* ============================================
+     Borderless Compact Mode for Zen Browser
+     ============================================ */
+  /* Only apply when Zen's compact mode is active */
+  :root[zen-compact-mode="true"] {
+    /* 1. Remove all margins around the browser content wrapper
+          so the webview touches the window edges */
+    #zen-tabbox-wrapper {
+      margin: 0 !important;
+    }
+    /* 2. Remove the gap at the top where the collapsed toolbar lives */
+    #zen-appcontent-navbar-wrapper:not(
+        :is([zen-has-hover], [has-popup-menu], [zen-compact-mode-active])
+      ) {
+      height: 0 !important;
+    }
+    /* 3. Remove rounded corners and drop-shadow from the webview container */
+    .browserSidebarContainer {
+      border-radius: 0 !important;
+      box-shadow: none !important;
+    }
+    /* 4. Remove border/shadow from floating sidebar / toolbar backgrounds */
+    .zen-toolbar-background {
+      box-shadow: none !important;
+      outline: none !important;
+      border-radius: 0 !important;
+    }
+    .zen-toolbar-background::before,
+    .zen-toolbar-background::after {
+      outline: none !important;
+      border-radius: 0 !important;
+    }
+    /* 5. Make the floating sidebar flush with screen edges */
+    #navigator-toolbox:not([animate="true"]) {
+      --zen-compact-float: 0px !important;
+      padding: 0 !important;
+      bottom: 0 !important;
+    }
+    /* 6. Remove padding inside the sidebar so tabs touch the edge */
+    #navigator-toolbox:not([animate="true"]) #titlebar {
+      padding: 0 !important;
+    }
+    /* 7. Remove extra top margin from titlebar in multi-toolbar setups */
+    &:not([zen-single-toolbar="true"]) #titlebar {
+      margin-top: 0 !important;
+    }
+    /* 8. Remove nav-bar side margins that create gaps when window 
+          controls are reversed */
+    #zen-appcontent-navbar-wrapper #nav-bar {
+      margin-left: 0 !important;
+      margin-right: 0 !important;
+    }
+  }
+}

themes/8d6ee23e-a67a-4799-b7cc-23dad0325126/preferences.json

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+[
+    {
+        "property": "mod.kian1991.enable",
+        "label": "Enable Borderless Compactmode",
+        "type": "checkbox",
+        "defaultValue": true
+    }
+]

themes/8d6ee23e-a67a-4799-b7cc-23dad0325126/readme.md

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+
+# Borderless Compact Mode
+A Zen Browser theme that removes all borders, shadows, and rounded corners when in **Compact Mode**, giving you a true edge-to-edge browsing experience.
+![Screenshot](https://raw.githubusercontent.com/kian1991/bordeless-compactmode/refs/heads/main/screenshot.png)
+## Features
+- **Edge-to-edge webview** — Removes all margins around the browser content so websites touch the window edges
+- **Zero rounded corners** — Flattens the browser container and sidebar for a sharp, modern look
+- **No shadows or borders** — Removes drop shadows and outlines from floating toolbars and sidebars
+- **Sidebar flush to edge** — Makes the compact mode sidebar touch the screen edge instead of floating
+- **Collapsible top toolbar** — Completely hides the top toolbar placeholder when collapsed
+## Requirements
+- Zen Browser Compact Mode must be enabled for this theme to take effect

themes/8d6ee23e-a67a-4799-b7cc-23dad0325126/theme.json

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+{
+    "id": "8d6ee23e-a67a-4799-b7cc-23dad0325126",
+    "name": "Borderless Compact Mode",
+    "description": "Removes borders, shadows & rounded corners in compact mode for a true edge-to-edge experience.",
+    "homepage": "https://github.com/kian1991/bordeless-compactmode",
+    "style": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/8d6ee23e-a67a-4799-b7cc-23dad0325126/chrome.css",
+    "readme": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/8d6ee23e-a67a-4799-b7cc-23dad0325126/readme.md",
+    "image": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/8d6ee23e-a67a-4799-b7cc-23dad0325126/image.png",
+    "author": "kian1991",
+    "version": "1.0.0",
+    "tags": [],
+    "createdAt": "2026-05-20",
+    "updatedAt": "2026-05-20",
+    "preferences": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/8d6ee23e-a67a-4799-b7cc-23dad0325126/preferences.json"
+}