Bug: Perma browser_feature_callout_resize.js | A promise chain failed to handle a rejection: [fluent] Missing message in locale en-US: unified-extensions-header-title - stack: (No stack available.) when Gecko 108 merges to Beta on 2022-11-14
Status: VERIFIED
Priority: P1
Resolution: FIXED
Created: 2022-11-02 14:55:50+00:00
Resolved: 2022-11-04 14:49:35+00:00

[Tracking Requested - why for this release]:

[Central-as-beta simulation:](https://treeherder.mozilla.org/jobs?repo=try&resultStatus=testfailed%2Cbusted%2Cexception%2Cretry%2Cusercancel%2Crunnable&revision=3ffac7f4d1be6b0ab0fecc2a318ee641b7c2cb16&group_state=expanded&selectedTaskRun=aRh6mLBVQWCUfHjZiMy3Yg.0) 
[How to run these simulations:](https://wiki.mozilla.org/Sheriffing/How_To/Beta_simulations#TRUNK_AS_EARLY_BETA)

[Failure log:](https://treeherder.mozilla.org/logviewer?job_id=395247891&repo=try&lineNumber=5637)
```
[task 2022-11-02T13:36:35.190Z] 13:36:35     INFO - TEST-PASS | browser/components/firefoxview/tests/browser/browser_feature_callout_resize.js | On third screen at 800x1300, the callout is positioned below the parent element - 
[task 2022-11-02T13:36:35.190Z] 13:36:35     INFO - Buffered messages finished
[task 2022-11-02T13:36:35.191Z] 13:36:35     INFO - TEST-UNEXPECTED-FAIL | browser/components/firefoxview/tests/browser/browser_feature_callout_resize.js | A promise chain failed to handle a rejection: [fluent] Missing message in locale en-US: unified-extensions-header-title - stack: (No stack available.)
[task 2022-11-02T13:36:35.192Z] 13:36:35     INFO - Rejection date: Wed Nov 02 2022 13:36:31 GMT+0000 (Coordinated Universal Time) - false == true - JS frame :: resource://testing-common/PromiseTestUtils.sys.mjs :: assertNoUncaughtRejections :: line 266
[task 2022-11-02T13:36:35.192Z] 13:36:35     INFO - Stack trace:
[task 2022-11-02T13:36:35.192Z] 13:36:35     INFO - resource://testing-common/PromiseTestUtils.sys.mjs:assertNoUncaughtRejections:266
[task 2022-11-02T13:36:35.192Z] 13:36:35     INFO - chrome://mochikit/content/browser-test.js:handleTask:1073
[task 2022-11-02T13:36:35.192Z] 13:36:35     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-11-02T13:36:35.193Z] 13:36:35     INFO - TEST-UNEXPECTED-FAIL | browser/components/firefoxview/tests/browser/browser_feature_callout_resize.js | A promise chain failed to handle a rejection: [fluent] Missing message in locale en-US: unified-extensions-header-title - stack: (No stack available.)
[task 2022-11-02T13:36:35.194Z] 13:36:35     INFO - Rejection date: Wed Nov 02 2022 13:36:31 GMT+0000 (Coordinated Universal Time) - false == true - JS frame :: resource://testing-common/PromiseTestUtils.sys.mjs :: assertNoUncaughtRejections :: line 266
[task 2022-11-02T13:36:35.194Z] 13:36:35     INFO - Stack trace:
[task 2022-11-02T13:36:35.194Z] 13:36:35     INFO - resource://testing-common/PromiseTestUtils.sys.mjs:assertNoUncaughtRejections:266
[task 2022-11-02T13:36:35.194Z] 13:36:35     INFO - chrome://mochikit/content/browser-test.js:handleTask:1073
[task 2022-11-02T13:36:35.195Z] 13:36:35     INFO - Leaving test bound feature_callout_is_repositioned_rtl
[task 2022-11-02T13:36:36.426Z] 13:36:36     INFO - GECKO(8138) | MEMORY STAT | vsize 20983533MB | residentFast 1514MB
[task 2022-11-02T13:36:36.431Z] 13:36:36     INFO - TEST-OK | browser/components/firefoxview/tests/browser/browser_feature_callout_resize.js | took 10599ms
[task 2022-11-02T13:36:36.559Z] 13:36:36     INFO - checking window state
[task 2022-11-02T13:36:36.766Z] 13:36:36     INFO - TEST-START | browser/components/firefoxview/tests/browser/browser_feature_callout_targeting.js
```