diff --git a/test/integration/thumbnail_view_spec.mjs b/test/integration/thumbnail_view_spec.mjs
index f44dd5808..bc4e64120 100644
--- a/test/integration/thumbnail_view_spec.mjs
+++ b/test/integration/thumbnail_view_spec.mjs
@@ -355,4 +355,73 @@ describe("PDF Thumbnail View", () => {
       );
     });
   });
+
+  describe("Menu keyboard navigation with multi-character keys (bug 2016212)", () => {
+    let pages;
+
+    beforeEach(async () => {
+      pages = await loadAndWait(
+        "page_with_number_and_link.pdf",
+        "#viewsManagerSelectorButton",
+        null,
+        null,
+        { enableSplitMerge: true }
+      );
+    });
+
+    afterEach(async () => {
+      await closePages(pages);
+    });
+
+    it("must navigate menus with ArrowDown and Tab keys", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          await page.click("#viewsManagerToggleButton");
+          await waitForThumbnailVisible(page, 1);
+
+          // Focus the views manager selector button
+          await page.waitForSelector("#viewsManagerSelectorButton", {
+            visible: true,
+          });
+          await page.focus("#viewsManagerSelectorButton");
+
+          // Open menu with Enter key
+          await page.keyboard.press("Enter");
+
+          // Wait for menu to be expanded
+          await waitForMenu(page, "#viewsManagerSelectorButton");
+
+          // Check that focus moved to the first menu button (pages)
+          await page.waitForSelector("#thumbnailsViewMenu:focus", {
+            visible: true,
+          });
+
+          // Press ArrowDown to navigate to second item
+          await page.keyboard.press("ArrowDown");
+
+          // Should now be on outlines button
+          await page.waitForSelector("#outlinesViewMenu:focus", {
+            visible: true,
+          });
+
+          // Press Tab to move to the manage button (should close views menu)
+          await page.keyboard.press("Tab");
+
+          // Wait for views manager menu to be collapsed
+          await waitForMenu(page, "#viewsManagerSelectorButton", false);
+
+          // Focus should be on manage button
+          await page.waitForSelector("#viewsManagerStatusActionButton:focus", {
+            visible: true,
+          });
+
+          // Open manage menu with Space key
+          await page.keyboard.press(" ");
+
+          // Wait for manage menu to be expanded
+          await waitForMenu(page, "#viewsManagerStatusActionButton");
+        })
+      );
+    });
+  });
 });
diff --git a/web/menu.js b/web/menu.js
index de917c6ec..9861c7377 100644
--- a/web/menu.js
+++ b/web/menu.js
@@ -28,6 +28,8 @@ class Menu {
 
   #lastIndex = -1;
 
+  #onFocusOutBound = this.#onFocusOut.bind(this);
+
   /**
    * Create a menu for the given button.
    * @param {HTMLElement} menuContainer
@@ -97,7 +99,18 @@ class Menu {
       },
       { signal }
     );
-    window.addEventListener("blur", this.#closeMenu.bind(this), { signal });
+    const closeMenu = this.#closeMenu.bind(this);
+    window.addEventListener("blur", closeMenu, { signal });
+    menu.addEventListener("focusout", this.#onFocusOutBound, { signal });
+  }
+
+  #onFocusOut({ relatedTarget }) {
+    if (
+      !this.#triggeringButton.contains(relatedTarget) &&
+      !this.#menu.contains(relatedTarget)
+    ) {
+      this.#closeMenu();
+    }
   }
 
   /**
@@ -112,6 +125,7 @@ class Menu {
 
       this.#openMenu();
     });
+    this.#triggeringButton.addEventListener("focusout", this.#onFocusOutBound);
 
     const { signal } = this.#menuAC;
 
@@ -148,7 +162,12 @@ class Menu {
             stopEvent(e);
             break;
           default:
-            const char = e.key.toLocaleLowerCase();
+            const { key } = e;
+            if (!/^\p{L}$/u.test(key)) {
+              // It isn't a single letter, so ignore it.
+              break;
+            }
+            const char = key.toLocaleLowerCase();
             this.#goToNextItem(e.target, true, item =>
               item.textContent.trim().toLowerCase().startsWith(char)
             );