Seems like tooltips that you get from attribute `title="test"` are not displayed inside the panel.

Tested also with [stackoverflow loaded in the panel](https://builder.addons.mozilla.org/addon/1053193/latest/), no tooltips when you hover mouse over hot, week, month. But the custom tooltips work, e.g. when you hover over tags.

Is there a way to enable tooltips in Add-on SDK panels, or the only way is going custom tooltips?