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It calls `pre[contenteditable].focus()`, but when talos tests run, the URL bar keeps having focus. Therefore, the `focus()` call in content cannot steal focus from the chrome UI. Then, it does not pay the cost of `Selection.modify` in the first loop because it does nothing when there is no selection ranges. (Before bug 1789967, `Selection` was collapsed to end of the document at loading by `HTMLEditor`, but it's now not performed, and due to the silent failure of the call of `focus()`, nobody collapse selection in the document.) Depends on D158551 Differential Revision: https://phabricator.services.mozilla.com/D158552
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