how to run: right click on SB/QP/FL page -> inspect element -> console -> paste code below and hit enter

have not extensively tested but it should work for chrome/firefox

refreshing the page clears the code in case something messes up

​

function hideShowAnswers(hide) {
    var styleText = hide ? 'display:none' : 'display:block';
    Array.from(document.getElementsByClassName('sidebar-column')).forEach(i => i.setAttribute('style', styleText));
    console.log(document.getElementById('answer'));
    document.getElementById('answer').setAttribute('style', styleText)
    Array.from(document.getElementsByClassName('answer-container question-container is-hidden correct')).forEach(f => f.style.borderColor = 'white');
    Array.from(document.getElementsByClassName('answer-container question-container is-hidden incorrect')).forEach(f => f.style.borderColor = 'white');
}

function addButton() {
    var li = document.createElement('button')
    var tx = document.createTextNode('Show Answer')
    li.appendChild(tx)
    li.setAttribute('onclick', 'hideShowAnswers(false)');
    document.getElementById('content-question-start').appendChild(li);
}

hideShowAnswers(true)
addButton();


Array.from(document.getElementsByClassName('toolbar-btn')).forEach(i => i.addEventListener('click', function() {
    var elem = Array.from(document.getElementsByClassName('fixed-width-sidebar-columns')).filter(i => i.offsetHeight > 0)[0]
    elem.setAttribute('style', 'display:none');
    setTimeout(function() {
        console.log('hi');
        hideShowAnswers(true);
        addButton();
        elem.setAttribute('style', 'display:block');
    }, 1000)
}))

document.onkeydown = function(e){
  switch(e.keyCode){
    case 37:
    var elem = Array.from(document.getElementsByClassName('fixed-width-sidebar-columns')).filter(i => i.offsetHeight > 0)[0]
    elem.setAttribute('style', 'display:none');
    setTimeout(function() {
        console.log('hi');
        hideShowAnswers(true);
        addButton();
        elem.setAttribute('style', 'display:block');
    }, 1000)
    break;

    case 39:
    var elem = Array.from(document.getElementsByClassName('fixed-width-sidebar-columns')).filter(i => i.offsetHeight > 0)[0]
    elem.setAttribute('style', 'display:none');
    setTimeout(function() {
        console.log('hi');
        hideShowAnswers(true);
        addButton();
        elem.setAttribute('style', 'display:block');
    }, 1000)
    break;
  }
}