Popup view fails when tab title contains HTML

[PinkPandaKatie]

When the title of a tab contains certain HTML elements, such as <textarea>, viewing the group in the popup can fail with a spinning gear.

Steps to reproduce:

1. Enable Popup view in options
2. Open https://developer.mozilla.org/en-US/docs/Web/HTML/Element/textarea
3. Open the popup view
4. Click the arrow next to the current tab group

Traceback:

Uncaught (in promise) TypeError: can't access property "addEventListener", node.querySelector(...) is null
    tabNodes moz-extension://ada9b373-b62e-45a0-a5f0-02ddfa830e88/popup-view/js/Frame.js:111
    getRenderedTabList moz-extension://ada9b373-b62e-45a0-a5f0-02ddfa830e88/popup-view/js/Frame.js:77
    _renderTabList moz-extension://ada9b373-b62e-45a0-a5f0-02ddfa830e88/popup-view/js/GroupDetailFrame.js:140
    render moz-extension://ada9b373-b62e-45a0-a5f0-02ddfa830e88/popup-view/js/GroupDetailFrame.js:16
    _renderGroupListItem moz-extension://ada9b373-b62e-45a0-a5f0-02ddfa830e88/popup-view/js/GroupsFrame.js:227
    _renderGroupListItem moz-extension://ada9b373-b62e-45a0-a5f0-02ddfa830e88/popup-view/js/GroupsFrame.js:226
    _renderGroupList moz-extension://ada9b373-b62e-45a0-a5f0-02ddfa830e88/popup-view/js/GroupsFrame.js:150
    render moz-extension://ada9b373-b62e-45a0-a5f0-02ddfa830e88/popup-view/js/GroupsFrame.js:14
    PopupView moz-extension://ada9b373-b62e-45a0-a5f0-02ddfa830e88/popup-view/index.js:19
    PopupView moz-extension://ada9b373-b62e-45a0-a5f0-02ddfa830e88/popup-view/index.js:22
    <anonymous> moz-extension://ada9b373-b62e-45a0-a5f0-02ddfa830e88/popup-view/index.js:11

This is almost certainly caused by failing to escape HTML in the title in the following code:

      const node = getElementNodeFromString(`
                <li data-tab="${Tab.id}" 
                    class="list__item list__item--tab ${
                      isActive ? "list__item--highlight" : ""
                    }" data-nav-row>
                    <button class="list__link" title="${Tab.title}
${Tab.url}">
                        <img class="tab__icon" 
                             src="${Tab.favIconUrl}" 
                             width="16" height="16" alt="" />
                        <span>${Tab.title}</span>
                    </button>
                    <button class="list__close" 
                            title="${browser.i18n.getMessage("closeTab")}"
                            ${options.hideCloseButton ? "hidden" : ""}></button>
                </li>
            `);