Oh, and the other possibility is that there's some relation to tests that run before this one. Something like: ``` ./mach mochitest browser/components/customizableui/test/ --end-at browser/components/customizableui/test/browser_884402_customize_from_overflow.js ``` may help with checking if that's the case.
Bug 1536312 Comment 35 Edit History
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Oh, and the other possibility is that there's some relation to tests that run before this one. Something like: ``` ./mach mochitest browser/components/customizableui/test/ --end-at browser/components/customizableui/test/browser_884402_customize_from_overflow.js ``` may help with checking if that's the case. You'll need to re-enable the offending test in the manifest first for this to work.