local floating_rule = {
    id = 'floating',
    rule_any = {
        instance = { 'copyq', 'pinentry' },
        class = {
            'Arandr', 'Blueman-manager', 'Gpick', 'Kruler', 'Sxiv',
            'Tor Browser', 'Wpa_gui', 'veromix', 'xtightvncviewer'
        },
        name    = {
            'Event Tester',  -- xev.
        },
        role    = {
            'AlarmWindow', -- Thunderbird's calendar.
            'ConfigManager', -- Thunderbird's about:config.
            'pop-up',-- e.g. Google Chrome's (detached) Developer Tools.
        }
    },
    properties = { floating = true }
}

return floating_rule