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Test Info:
add_task(async function testTabCloseShortcut() {
let win = await BrowserTestUtils.openNewBrowserWindow();
await SimpleTest.promiseFocus(win);
function onTabClose() {
ok(false, "shouldn't have gotten the TabClose event for the last tab");
}
var tab = win.gBrowser.selectedTab;
tab.addEventListener("TabClose", onTabClose);
EventUtils.synthesizeKey("w", { accelKey: true }, win);
ok(win.closed, "accel+w closed the window immediately");
tab.removeEventListener("TabClose", onTabClose);
});