diff --git a/extension/src/popup/styles.css b/extension/src/popup/styles.css
index 146e72a..6a35990 100644
--- a/extension/src/popup/styles.css
+++ b/extension/src/popup/styles.css
@@ -10,6 +10,7 @@
   --bg-page:       #0d1117;
   --bg-pane:       #161b22;
   --bg-elevated:   #21262d;
+  --bg-input:      #161b22;
   --border-subtle: #30363d;
 
   /* Text */
@@ -1332,3 +1333,32 @@ textarea {
   padding: 1px 5px;
   border-radius: 3px;
 }
+
+/* Glyph button used by smart-input affordances. Sits inline with an input. */
+.glyph-btn {
+  min-width: 28px;
+  height: 28px;
+  padding: 0 6px;
+  background: var(--bg-input);
+  border: 1px solid var(--border-subtle);
+  border-radius: 3px;
+  color: var(--text-muted);
+  font-family: inherit;
+  font-size: 14px;
+  cursor: pointer;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+}
+.glyph-btn:hover:not(:disabled) {
+  border-color: var(--accent);
+  color: var(--accent);
+}
+.glyph-btn:focus-visible {
+  outline: none;
+  box-shadow: var(--focus-ring);
+}
+.glyph-btn:disabled {
+  opacity: 0.4;
+  cursor: not-allowed;
+}
diff --git a/extension/src/shared/form-affordances/__tests__/url-tools.test.ts b/extension/src/shared/form-affordances/__tests__/url-tools.test.ts
new file mode 100644
index 0000000..7794f84
--- /dev/null
+++ b/extension/src/shared/form-affordances/__tests__/url-tools.test.ts
@@ -0,0 +1,46 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { wireFillFromTab } from '../url-tools';
+
+describe('wireFillFromTab', () => {
+  let form: HTMLElement;
+  let sendMessage: ReturnType<typeof vi.fn>;
+
+  beforeEach(() => {
+    form = document.createElement('div');
+    form.innerHTML = `
+      <input id="f-title" type="text" />
+      <div class="inline-row">
+        <input id="f-url" type="text" />
+        <button id="fill-from-tab-btn" class="glyph-btn" type="button" title="fill from active tab">⤓</button>
+      </div>
+    `;
+    document.body.appendChild(form);
+    sendMessage = vi.fn();
+  });
+
+  it('fills url + title from active tab on click', async () => {
+    sendMessage.mockResolvedValue({ ok: true, data: { url: 'https://github.com/login', title: 'GitHub' } });
+    wireFillFromTab(form, { sendMessage });
+    (form.querySelector('#fill-from-tab-btn') as HTMLButtonElement).click();
+    await Promise.resolve(); await Promise.resolve();
+    expect((form.querySelector('#f-url') as HTMLInputElement).value).toBe('https://github.com/login');
+    expect((form.querySelector('#f-title') as HTMLInputElement).value).toBe('GitHub');
+  });
+
+  it('does not overwrite a non-empty title', async () => {
+    (form.querySelector('#f-title') as HTMLInputElement).value = 'My GitHub';
+    sendMessage.mockResolvedValue({ ok: true, data: { url: 'https://github.com/login', title: 'GitHub' } });
+    wireFillFromTab(form, { sendMessage });
+    (form.querySelector('#fill-from-tab-btn') as HTMLButtonElement).click();
+    await Promise.resolve(); await Promise.resolve();
+    expect((form.querySelector('#f-title') as HTMLInputElement).value).toBe('My GitHub');
+  });
+
+  it('disables the button if SW returns null', async () => {
+    sendMessage.mockResolvedValue({ ok: true, data: null });
+    wireFillFromTab(form, { sendMessage });
+    (form.querySelector('#fill-from-tab-btn') as HTMLButtonElement).click();
+    await Promise.resolve(); await Promise.resolve();
+    expect((form.querySelector('#fill-from-tab-btn') as HTMLButtonElement).disabled).toBe(true);
+  });
+});
diff --git a/extension/src/shared/form-affordances/url-tools.ts b/extension/src/shared/form-affordances/url-tools.ts
new file mode 100644
index 0000000..93e8d13
--- /dev/null
+++ b/extension/src/shared/form-affordances/url-tools.ts
@@ -0,0 +1,24 @@
+import { GLYPH_FILL_FROM_TAB } from '../glyphs';
+
+export interface FillFromTabOpts {
+  sendMessage: (msg: { type: 'get_active_tab_url' }) => Promise<{ ok: boolean; data?: { url: string; title: string } | null }>;
+}
+
+export function wireFillFromTab(form: HTMLElement, opts: FillFromTabOpts): void {
+  const btn = form.querySelector<HTMLButtonElement>('#fill-from-tab-btn');
+  if (!btn) return;
+  btn.addEventListener('click', async () => {
+    const resp = await opts.sendMessage({ type: 'get_active_tab_url' });
+    if (!resp.ok || !resp.data) {
+      btn.disabled = true;
+      btn.title = 'no active tab';
+      return;
+    }
+    const urlEl = form.querySelector<HTMLInputElement>('#f-url');
+    const titleEl = form.querySelector<HTMLInputElement>('#f-title');
+    if (urlEl) urlEl.value = resp.data.url;
+    if (titleEl && !titleEl.value.trim()) titleEl.value = resp.data.title;
+  });
+}
+
+export const FILL_FROM_TAB_BTN_HTML = `<button id="fill-from-tab-btn" class="glyph-btn" type="button" title="fill from active tab">${GLYPH_FILL_FROM_TAB}</button>`;
diff --git a/extension/src/vault/vault.css b/extension/src/vault/vault.css
index 5340a73..02763eb 100644
--- a/extension/src/vault/vault.css
+++ b/extension/src/vault/vault.css
@@ -10,6 +10,7 @@
   --bg-page:       #0d1117;
   --bg-pane:       #161b22;
   --bg-elevated:   #21262d;
+  --bg-input:      #161b22;
   --border-subtle: #30363d;
 
   /* Text */
@@ -1362,3 +1363,32 @@ textarea {
 .vault-lock-screen__form input {
   text-align: center;
 }
+
+/* Glyph button used by smart-input affordances. Sits inline with an input. */
+.glyph-btn {
+  min-width: 28px;
+  height: 28px;
+  padding: 0 6px;
+  background: var(--bg-input);
+  border: 1px solid var(--border-subtle);
+  border-radius: 3px;
+  color: var(--text-muted);
+  font-family: inherit;
+  font-size: 14px;
+  cursor: pointer;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+}
+.glyph-btn:hover:not(:disabled) {
+  border-color: var(--accent);
+  color: var(--accent);
+}
+.glyph-btn:focus-visible {
+  outline: none;
+  box-shadow: var(--focus-ring);
+}
+.glyph-btn:disabled {
+  opacity: 0.4;
+  cursor: not-allowed;
+}