config.html

<script type="text/javascript">
    RED.nodes.registerType('config-firebase', {
        category: "config",
        defaults: {
          apikey: {value: ""},
          authdomain: {value: ""},
          bucket: {value: ""},
          project: {value: ""},
        },
        label: function() {
            return this.project+"-firebase-config";
        }
    });
</script>

<script type="text/x-red" data-template-name="config-firebase">
    <div class="form-row">
        <label for="node-config-input-project"><i class="icon-tag"></i> Firebase Project</label>
        <input type="text" id="node-config-input-project" placeholder="Firebase Project Id">
    </div>
    <div class="form-row">
        <label for="node-config-input-apikey"><i class="icon-tag"></i> API Key</label>
        <input type="text" id="node-config-input-apikey" placeholder="API Key">
    </div>
    <div class="form-row">
        <label for="node-config-input-authdomain"><i class="icon-tag"></i> Auth domain</label>
        <input type="text" id="node-config-input-authdomain" placeholder="Auth domain">
    </div>
    <div class="form-row">
        <label for="node-config-input-bucket"><i class="icon-tag"></i> Storage Bucket</label>
        <input type="text" id="node-config-input-bucket" placeholder="Storage Bucket">
    </div>
</script>

<script type="text/x-red" data-help-name="config-firebase">
    <p>Configuration of firebase storage</p>
</script>