diff --git a/packages/docusaurus-theme-classic/src/theme/DocSidebarItem/Category/styles.module.css b/packages/docusaurus-theme-classic/src/theme/DocSidebarItem/Category/styles.module.css
index 9ddd0aa8ba14..b157b2bd1579 100644
--- a/packages/docusaurus-theme-classic/src/theme/DocSidebarItem/Category/styles.module.css
+++ b/packages/docusaurus-theme-classic/src/theme/DocSidebarItem/Category/styles.module.css
@@ -23,4 +23,5 @@ TODO merge this logic back in Infima?
   line-clamp: 2;
   -webkit-box-orient: vertical;
   -webkit-line-clamp: 2;
+  padding-bottom: 1px;
 }
diff --git a/packages/docusaurus-theme-classic/src/theme/DocSidebarItem/Link/styles.module.css b/packages/docusaurus-theme-classic/src/theme/DocSidebarItem/Link/styles.module.css
index a48f210974ac..6c8cdef36b3a 100644
--- a/packages/docusaurus-theme-classic/src/theme/DocSidebarItem/Link/styles.module.css
+++ b/packages/docusaurus-theme-classic/src/theme/DocSidebarItem/Link/styles.module.css
@@ -15,4 +15,5 @@
   line-clamp: 2;
   -webkit-box-orient: vertical;
   -webkit-line-clamp: 2;
+  padding-bottom: 1px;
 }
diff --git a/packages/docusaurus-theme-classic/src/theme/DocSidebarItem/__tests__/index.test.ts b/packages/docusaurus-theme-classic/src/theme/DocSidebarItem/__tests__/index.test.ts
new file mode 100644
index 000000000000..454b3b9a97fa
--- /dev/null
+++ b/packages/docusaurus-theme-classic/src/theme/DocSidebarItem/__tests__/index.test.ts
@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+import {describe, expect, it} from 'vitest';
+
+describe('DocSidebarItem label styles', () => {
+  it('DocSidebarItem/Link contains bottom padding to prevent Firefox descender clipping', () => {
+    const cssPath = path.resolve(__dirname, '../Link/styles.module.css');
+    const cssContent = fs.readFileSync(cssPath, 'utf8');
+
+    expect(cssContent).toMatch(/\.linkLabel\s*\{[^}]*line-clamp:\s*2/);
+    expect(cssContent).toMatch(/\.linkLabel\s*\{[^}]*padding-bottom:\s*1px/);
+  });
+
+  it('DocSidebarItem/Category contains bottom padding to prevent Firefox descender clipping', () => {
+    const cssPath = path.resolve(__dirname, '../Category/styles.module.css');
+    const cssContent = fs.readFileSync(cssPath, 'utf8');
+
+    expect(cssContent).toMatch(/\.categoryLinkLabel\s*\{[^}]*line-clamp:\s*2/);
+    expect(cssContent).toMatch(/\.categoryLinkLabel\s*\{[^}]*padding-bottom:\s*1px/);
+  });
+});