Firefox中缺少水平滚动

Question

有一个使用ASP.NET WebForms的较旧的应用程序。它使用 asp：ListBox 和始终启用的水平滚动条。生成的HTML如下所示：

.box {
    border: none;
    background: none;
    height: 230px;
    width: 280px;    
    overflow: visible;
    overflow-x: scroll;
    padding: 10px;     
}

<select size="4" name="ctl00$ContentPlaceHolder$usersListBox" id="ContentPlaceHolder_usersListBox" class="box" horizontalscrollbar="true" style=" ">
        <option value="Vielka Gay (xage@mailinator.com)">Vielka Gay (xage@mailinator.com)</option>
        <option value="VerylongFirstnameEverPossibleInTheApp VerylongSurnnameEverPossibleInTheApp (verylongpossibleemailhost@verylongpossibleemailhost.com)">VerylongFirstnameEverPossibleInTheApp VerylongSurnnameEverPossibleInTheApp (verylongpossibleemailhost@verylongpossibleemailhost.com)</option>
        <option value="September Newton (mojyzyfal@mailinator.com)">September Newton (mojyzyfal@mailinator.com)</option>
        <option value="Palmer Herman (vuqanagi@mailinator.com)">Palmer Herman (vuqanagi@mailinator.com)</option>
        <option value="Inez Moss (mybahidime@mailinator.com)">Inez Moss (mybahidime@mailinator.com)</option>
        <option value="Tanya Mckay (jyfy@mailinator.com)">Tanya Mckay (jyfy@mailinator.com)</option>
        <option value="Debra Davenport (ryqeluquw@mailinator.com)">Debra Davenport (ryqeluquw@mailinator.com)</option>
        <option value="Donovan Wilkerson (gasude@mailinator.com)">Donovan Wilkerson (gasude@mailinator.com)</option>
        <option value="Dai Price (niwa@mailinator.com)">Dai Price (niwa@mailinator.com)</option>
        <option value="Maris Mason (temerikuk@mailinator.com)">Maris Mason (temerikuk@mailinator.com)</option>
        <option value="India Lara (rajefavid@mailinator.com)">India Lara (rajefavid@mailinator.com)</option>
        <option value="Portia Grimes (dyhisi@mailinator.com)">Portia Grimes (dyhisi@mailinator.com)</option>
        <option value="Willa Giles (luhyvyke@mailinator.com)">Willa Giles (luhyvyke@mailinator.com)</option>
</select>

因此，在Firefox中（我在Windows上使用79.0 64位版本），没有滚动条：

Chrome和Edge看起来不错：

UPD。目前，我已经创建了bug on bugzilla