ReactFire fiddle

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.1/JSXTransformer.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.1/react-with-addons.js"></script>
<script src="https://cdn.firebase.com/js/client/2.2.4/firebase.js"></script>
<script src="https://rawgit.com/puf/reactfire/puf-add-id-to-array-items/src/reactfire.js"></script>
<script src="https://facebook.github.io/react/js/jsfiddle-integration.js"></script>

<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

JavaScript 1.7

/** @jsx React.DOM */
var TodoList3 = React.createClass({
  handleClick: function(key) {
    if (this.props.onClick) {
      this.props.onClick(key);
    }
  },
  render: function() {
    var list = this;
    var createItem = function(item, index) {
      var boundClick = list.handleClick.bind(list, item['$id']);
      return <li key={ item['$id'] } onClick={boundClick}>{ item.text }</li>;
    };
    return <ul>{ this.props.items.map(createItem) }</ul>;
  }
});

var TodoApp3 = React.createClass({
  mixins: [ReactFireMixin],

  getInitialState: function() {
    return {items: [], text: ""};
  },

  componentWillMount: function() {
    var firebaseRef = new Firebase("https://ReactFireTodoApp.firebaseio.com/items/");
    this.setState({ ref: firebaseRef });
    this.bindAsArray(firebaseRef.limitToLast(25), "items");
  },

  onChange: function(e) {
    this.setState({text: e.target.value});
  },

  handleSubmit: function(e) {
    e.preventDefault();
    if (this.state.text && this.state.text.trim().length !== 0) {
      this.firebaseRefs["items"].push({
        text: this.state.text
      });
      this.setState({text: ""});
    }
  },
  handleClick: function(key) {
    var firebaseRef = this.state.ref;
    firebaseRef.child(key).remove();
  },

  render: function() {
    return (
      <div>
        <TodoList3 items={ this.state.items } onClick={this.handleClick} />
        <form onSubmit={ this.handleSubmit }>
          <input onChange={ this.onChange } value={ this.state.text } />
          <button>{ "Add #" + (this.state.items.length + 1) }</button>
        </form>
      </div>
    );
  }
});

React.render(<TodoApp3 />, document.getElementById("container"));