Проблема с XUL

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet href="chrome://sticker-toolbar/skin/sticker-preferences.css" type="text/css"?>

<prefwindow id="StickerPreferences" title="Stickers Preferences" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
    <prefpane id="pane1" label="General">
        <preferences>
            <preference id="sticker_auth_email" name="sticker.email" type="string"/>
            <preference id="sticker_auth_passwd" name="sticker.passwd" type="string"/>
        </preferences>
        
        <hbox>
            <label control="symbol" value="E-mail: " />
            <textbox preference="sticker_auth_email" id="email" />
        </hbox>
        <hbox>
            <label control="symbol" value="Password: " />
            <textbox preference="sticker_auth_passwd" id="passwd" />
        </hbox>
    </prefpane>
    
    <prefpane id="pane1" label="Filters">
        <preferences>
            <preference id="sticker_filter_friends" name="sticker.filter_friends" type="string"/>
        </preferences>

        <hbox>
            <label control="symbol" value="Friends: " />
            <textbox preference="sticker_filter_friends" id="filter_friends" />
        </hbox>
    </prefpane>
</prefwindow>