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Level 4

It doesn't perfectly answer your question but I found adding the following script as a browser bookmark was helpful as it allowed me to quickly exit "QA" mode while testing. 

 

javascript: (function () {
    if (window.location.href.indexOf('?') != -1) {
        var parts = window.location.href.split('at_preview_token', 2);
        if (parts.length > 1) {
            window.location.href = parts[0].concat('at_preview_token=');
        } else {
            window.location.href = window.location.href.concat("&at_preview_token=")
        }
    } else {
        window.location.href = window.location.href.concat("?at_preview_token=")
    }
})();