From a brief investigation, there's something wrong especially on Linux, sometimes the click event just breaks. the urlbar is focused as expected, we click on it, but nothing happens. We were using mousedown before, and a later test using mousedown was failing as well, so either the event doesn't go through, or the handler breaks somehow.
Summary: Intermittent browser/base/content/test/urlbar/browser_urlbarSearchSuggestions_opt-out.js | Test timed out - → Intermittent browser/components/urlbar/tests/legacy/browser_urlbarSearchSuggestions_opt-out.js | Test timed out -
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