Thunderbird tests using `BrowserTestUtils.promiseAlertDialog()` are failing with: `can't access property "accept", this._buttons is undefined - stack: getButton@chrome://global/content/elements/dialog.js` Making [this method](https://hg.mozilla.org/mozilla-central/rev/34da030ad47df0dcad36609734f8b22ad6591234#l1.32) sync again fixes the tests. I'm not sure why and how is this happening.
Bug 1797390 Comment 0 Edit History
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Thunderbird tests using `BrowserTestUtils.promiseAlertDialog()` are failing with: `can't access property "accept", this._buttons is undefined - stack: getButton@chrome://global/content/elements/dialog.js` Making [this method](https://hg.mozilla.org/mozilla-central/rev/34da030ad47df0dcad36609734f8b22ad6591234#l1.32) sync again fixes the tests. I'm not sure why and how is this happening. This seems to be related to bug 1708090, but bug 1796408 made the existing issue bubble up.