1 files changed, 13 insertions, 0 deletions
diff --git a/toolkit/components/thumbnails/test/browser_thumbnails_removed_tab.js b/toolkit/components/thumbnails/test/browser_thumbnails_removed_tab.js
new file mode 100644
index 0000000000..9d2138d3d0
--- /dev/null
+++ b/toolkit/components/thumbnails/test/browser_thumbnails_removed_tab.js
@@ -0,0 +1,13 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+add_task(async function thumbnails_bug1775638() {
+  const tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "https://example.com"
+  );
+  const canvas = document.createElement("canvas");
+  const promise = PageThumbs.captureToCanvas(tab.linkedBrowser, canvas);
+  gBrowser.removeTab(tab);
+  is(await promise, canvas);
+});