Prompt before closing
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This may already be a feature and I just can't find it: Prompt Before Closing. I have never wanted this in any other browser, but it would be seriously useful in Vivaldi. I really like the Web Panel feature and, once I am logged in to all useful accounts in Web Panels, I love being able to take a quick, half-page, glance at different sites. Only problem is, if I accidentally close out of Vivaldi, I have to log in to everything again. I'd like a prompt that says, "Are you sure you want to close Vivaldi."