手风琴在Firefox中不起作用，但在其他浏览器中起作用

Question

在Firefox 51.0.1中遇到手风琴代码段的问题。代码适用于Edge，Chrome，Safari等。不确定从何处开始。没有真正得到这个。非常感谢协助。

<div class="options_section">
    <div class="options_container">
        <div class="maincontainer">
            <div class="panel-wrapper">
                <h3 style="color: white">Text</h3>
                <p style="color: white">Text</p>
                <div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
                    <div class="panel panel-default">
                        <div class="panel-heading" role="tab" id="headingOne2">
                            <h3 class="panel-title">
                                <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseOne" aria-expanded="true" aria-controls="collapseOne"> <img class="open-arrow" src="assets/white_open_arrow.png"> <img class="down-arrow" src="assets/white_closed_arrow.png">Text</a>
                            </h3>
                        </div>
                        <div id="collapseOne" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOne">
                            <div class="panel-body">Text</div>
                        </div>
                    </div>
                    <div class="panel panel-default">
                        <div class="panel-heading" role="tab" id="headingTwo2">
                            <h3 class="panel-title">
                                <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"> <img class="open-arrow" src="assets/white_open_arrow.png"> <img class="down-arrow" src="assets/white_closed_arrow.png">Text</a>
                            </h3>
                        </div>
                        <div id="collapseTwo" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingTwo">
                            <div class="panel-body">Text</div>
                        </div>
                    </div>
                    <div class="panel panel-default">
                        <div class="panel-heading" role="tab" id="headingThree2">
                            <h3 class="panel-title">
                                <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseThree" aria-expanded="false" aria-controls="collapseThree"> <img class="open-arrow" src="assets/white_open_arrow.png"> <img class="down-arrow" src="assets/white_closed_arrow.png">Text</a>
                            </h3>
                        </div>
                        <div id="collapseThree" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingThree">
                            <div class="panel-body">Text</div>
                        </div>
                    </div>
                </div>
                <div class="clearfix"></div>
            </div>
        </div>
    </div>