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javascript:
(function () {
    const gmailWindow = window;
    if(gmailWindow.location.href.indexOf("https://mail.google.com/") === -1){
        alert('You have to run the bookmarklet from a Gmail window');
        return;
    }
    gmailWindow.location.assign('https://mail.google.com/mail/u/0/#settings/accounts');
    const xpath = "//span[text()='Check mail now']";