diff --git a/src/frontend/eslint.config.mjs b/src/frontend/eslint.config.mjs
index e85ffc51a..1034ca018 100644
--- a/src/frontend/eslint.config.mjs
+++ b/src/frontend/eslint.config.mjs
@@ -50,9 +50,16 @@ export default [
     ...tseslint.configs.disableTypeChecked,
   },
   {
-    files: ['tests/**/*.ts'],
+    files: ['tests/e2e/**/*.ts'],
     ...tseslint.configs.disableTypeChecked,
   },
+  {
+    files: ['tests/unit/**/*.ts', 'tests/typecheck/**/*.ts'],
+    rules: {
+      '@typescript-eslint/no-unsafe-assignment': 'off',
+      '@typescript-eslint/no-unsafe-argument': 'off',
+    },
+  },
 
   // Disable all formatting rules.
   prettierConfig,
diff --git a/src/frontend/scripts/fetch-with-proxy.ts b/src/frontend/scripts/fetch-with-proxy.ts
index ad718a1ff..16b1394e8 100644
--- a/src/frontend/scripts/fetch-with-proxy.ts
+++ b/src/frontend/scripts/fetch-with-proxy.ts
@@ -28,4 +28,4 @@ export function fetchWithProxy(url: string | URL, options: RequestInit = {}): Pr
 
   const parsedUrl = url instanceof URL ? url : new URL(url);
   return fetch(url, { ...options, agent: selectAgent(parsedUrl) });
-}
\ No newline at end of file
+}
diff --git a/src/frontend/src/components/FooterLinks.astro b/src/frontend/src/components/FooterLinks.astro
index 0c6879d75..279596495 100644
--- a/src/frontend/src/components/FooterLinks.astro
+++ b/src/frontend/src/components/FooterLinks.astro
@@ -5,7 +5,9 @@ import config from 'virtual:starlight/user-config';
 const links = config.social || [];
 const gitHubLink = links.find((link) => link.label === 'GitHub')?.href ?? null;
 const discordLink = links.find((link) => link.label === 'Discord')?.href ?? null;
-const is404 = Astro.url.pathname === '/404' || Astro.url.pathname === '/404/';
+const is404 =
+  Astro.locals.starlightRoute?.entry?.slug === '404' ||
+  /^\/(?:[^/]+\/)?404\/?$/.test(Astro.url.pathname);
 ---
 
 {
diff --git a/src/frontend/src/components/OsAwareTabs.astro b/src/frontend/src/components/OsAwareTabs.astro
index 1b509c020..966d904f7 100644
--- a/src/frontend/src/components/OsAwareTabs.astro
+++ b/src/frontend/src/components/OsAwareTabs.astro
@@ -25,7 +25,7 @@ const { syncKey = 'terminal' } = Astro.props;
         function activateTabByLabel(starlightTabs, label) {
           const tabs = Array.from(starlightTabs.querySelectorAll('[role="tab"]'));
           const panels = Array.from(starlightTabs.querySelectorAll(':scope > [role="tabpanel"]'));
-          const tabIndex = tabs.findIndex((tab) => tab instanceof HTMLAnchorElement && tab.textContent?.trim() === label);
+          const tabIndex = tabs.findIndex((tab) => tab.textContent?.trim() === label);
 
           if (tabIndex < 0) return;
 
diff --git a/src/frontend/tests/unit/custom-components.vitest.test.ts b/src/frontend/tests/unit/custom-components.vitest.test.ts
index b00b889c0..082abf2d3 100644
--- a/src/frontend/tests/unit/custom-components.vitest.test.ts
+++ b/src/frontend/tests/unit/custom-components.vitest.test.ts
@@ -10,6 +10,7 @@ import CTABanner from '@components/CTABanner.astro';
 import CapabilityGrid from '@components/CapabilityGrid.astro';
 import CodespacesButton from '@components/CodespacesButton.astro';
 import Expand from '@components/Expand.astro';
+import FooterLinks from '@components/FooterLinks.astro';
 import FeatureShowcase from '@components/FeatureShowcase.astro';
 import FluidGrid from '@components/FluidGrid.astro';
 import FooterPreferences from '@components/FooterPreferences.astro';
@@ -754,4 +755,67 @@ describe('custom Astro component render coverage', () => {
     expect(html).toContain(`origHeight%3D${heroImage.height}`);
     expect(html).not.toContain('h=1000');
   });
+
+  it('hides footer community links on localized 404 pages', async () => {
+    const html = normalizeHtml(
+      await renderComponent(FooterLinks, {
+        requestUrl: 'https://aspire.dev/ja/404/',
+        locals: {
+          starlightRoute: {
+            editUrl:
+              'https://github.com/microsoft/aspire.dev/edit/main/src/frontend/src/content/docs/404.mdx',
+            entry: {
+              id: '404',
+              slug: '404',
+              filePath: 'src/content/docs/404.mdx',
+              data: {},
+            },
+          },
+        },
+      })
+    );
+
+    expect(html).not.toContain('footer.community');
+    expect(html).not.toContain('https://x.com/aspiredotdev');
+  });
+
+  it('hides footer community links when the pathname fallback matches 404 routes', async () => {
+    const fallbackRoute: StarlightRoute = {
+      editUrl:
+        'https://github.com/microsoft/aspire.dev/edit/main/src/frontend/src/content/docs/test.mdx',
+      entry: {
+        id: 'docs/test',
+        slug: '',
+        filePath: 'src/content/docs/test.mdx',
+        data: {},
+      },
+    };
+
+    for (const requestUrl of ['https://aspire.dev/404/', 'https://aspire.dev/ja/404/']) {
+      const html = normalizeHtml(
+        await renderComponent(FooterLinks, {
+          requestUrl,
+          locals: {
+            starlightRoute: fallbackRoute,
+          },
+        })
+      );
+
+      expect(html).not.toContain('footer.community');
+      expect(html).not.toContain('https://x.com/aspiredotdev');
+    }
+  });
+
+  it('renders OsAwareTabs activation logic without anchor-only tab assumptions', async () => {
+    const html = normalizeHtml(
+      await renderComponent(OsAwareTabs, {
+        props: { syncKey: 'terminal' },
+        slots: { unix: 'echo unix', windows: 'Write-Host windows' },
+      })
+    );
+    const inlineScript = html.split('<script>').at(-1) ?? '';
+
+    expect(inlineScript).toContain('tab.textContent?.trim() === label');
+    expect(inlineScript).not.toContain('HTMLAnchorElement');
+  });
 });