Bug: Intermittent browser/components/customizableui/test/browser_drag_outside_palette.js | Uncaught exception in test - at chrome://mochikit/content/tests/SimpleTest/EventUtils.js:2817 - Error: No data transfer object after synthesizing the mouse!
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2022-02-09 07:07:50+00:00
Resolved: 2023-01-03 17:01:53+00:00

**Filed by:** abutkovits [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=367195859&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/DjdXiKM-Q0m4f2xbO7IG1w/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2022-02-09T06:09:17.434Z] 06:09:17     INFO - TEST-PASS | browser/components/customizableui/test/browser_drag_outside_palette.js | Button should be in the palette - 
[task 2022-02-09T06:09:17.435Z] 06:09:17     INFO - Buffered messages finished
[task 2022-02-09T06:09:17.436Z] 06:09:17     INFO - TEST-UNEXPECTED-FAIL | browser/components/customizableui/test/browser_drag_outside_palette.js | Uncaught exception in test - at chrome://mochikit/content/tests/SimpleTest/EventUtils.js:2817 - Error: No data transfer object after synthesizing the mouse!
[task 2022-02-09T06:09:17.436Z] 06:09:17     INFO - Stack trace:
[task 2022-02-09T06:09:17.437Z] 06:09:17     INFO - synthesizeDragOver@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:2817:11
[task 2022-02-09T06:09:17.437Z] 06:09:17     INFO - synthesizeDrop@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:2939:52
[task 2022-02-09T06:09:17.437Z] 06:09:17     INFO - simulateItemDrag@chrome://mochitests/content/browser/browser/components/customizableui/test/head.js:228:17
[task 2022-02-09T06:09:17.438Z] 06:09:17     INFO - @chrome://mochitests/content/browser/browser/components/customizableui/test/browser_drag_outside_palette.js:28:19
[task 2022-02-09T06:09:17.438Z] 06:09:17     INFO - Leaving test bound 
[task 2022-02-09T06:09:17.439Z] 06:09:17     INFO - Console message: [JavaScript Error: "TypeError: event.target.closest is not a function" {file: "resource:///modules/UrlbarInput.jsm" line: 2994}]
[task 2022-02-09T06:09:17.439Z] 06:09:17     INFO - _on_mousedown@resource:///modules/UrlbarInput.jsm:2994:26
[task 2022-02-09T06:09:17.440Z] 06:09:17     INFO - handleEvent@resource:///modules/UrlbarInput.jsm:426:23
[task 2022-02-09T06:09:17.440Z] 06:09:17     INFO - synthesizeMouseAtPoint@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:628:32
[task 2022-02-09T06:09:17.440Z] 06:09:17     INFO - synthesizeMouse@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:562:10
[task 2022-02-09T06:09:17.440Z] 06:09:17     INFO - synthesizeMouseAtCenter@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:735:10
[task 2022-02-09T06:09:17.440Z] 06:09:17     INFO - synthesizeDragOver@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:2805:26
[task 2022-02-09T06:09:17.440Z] 06:09:17     INFO - synthesizeDrop@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:2939:52
[task 2022-02-09T06:09:17.440Z] 06:09:17     INFO - simulateItemDrag@chrome://mochitests/content/browser/browser/components/customizableui/test/head.js:228:17
[task 2022-02-09T06:09:17.440Z] 06:09:17     INFO - @chrome://mochitests/content/browser/browser/components/customizableui/test/browser_drag_outside_palette.js:28:19
[task 2022-02-09T06:09:17.440Z] 06:09:17     INFO - 
[task 2022-02-09T06:09:17.440Z] 06:09:17     INFO - GECKO(5741) | MEMORY STAT | vsize 20459MB | residentFast 679MB | heapAllocated 481MB
[task 2022-02-09T06:09:17.440Z] 06:09:17     INFO - TEST-OK | browser/components/customizableui/test/browser_drag_outside_palette.js | took 537ms
```