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These tests insert a <browser> into the DOM via tabbrowser, and immediately try to get a hold to the underlying document right after. However the a11y tree is constructed after frame construction, and with bug 1584935 there's no longer a guarantee that it gets done in time without these explicit flushes. Note that I couldn't reproduce these failures locally, so take the diagnostic with a grain of salt, but I believe it's accurate and that this is the right fix. Differential Revision: https://phabricator.services.mozilla.com/D75715 |
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mochitest |