diff --git a/src/contentScripts/communityConsole/flattenThreads/replyActionHandler.js b/src/contentScripts/communityConsole/flattenThreads/replyActionHandler.js
new file mode 100644
index 0000000..99ef0fc
--- /dev/null
+++ b/src/contentScripts/communityConsole/flattenThreads/replyActionHandler.js
@@ -0,0 +1,74 @@
+import {waitFor} from 'poll-until-promise';
+
+import {parseUrl} from '../../../common/commonUtils';
+import {getOptions} from '../../../common/optionsUtils';
+
+const kOpenReplyEditorIntervalInMs = 500;
+const kOpenReplyEditorTimeoutInMs = 10 * 1000;
+
+// @TODO: Handle observing when the hash is added after the page has loaded.
+export default class FlattenThreadsReplyActionHandler {
+  /**
+   * @param {Object} options Options object which at least includes the
+   *     |flattenthreads| and |flattenthreads_switch_enabled| options.
+   */
+  constructor(options = null) {
+    this.options = options;
+  }
+
+  async handleIfApplicable() {
+    if (await this.isFeatureEnabled()) this.handle();
+  }
+
+  async handle() {
+    const hash = window.location.hash;
+    if (hash === '#action=reply') await this.openReplyEditor();
+  }
+
+  async openReplyEditor() {
+    // We erase the hash so the Community Console doesn't open the reply
+    // editor, since we're going to do that instead.
+    window.location.hash = '';
+
+    const messageId = this.getCurrentMessageId();
+    if (messageId === null) {
+      console.error(
+          '[FlattenThreadsReplyActionHandler] Could not parse current message id.');
+      return;
+    }
+
+    const replyButton = await waitFor(async () => {
+      const replyButton = document.querySelector(
+          '[data-twpt-message-id="' + messageId +
+          '"] twpt-flatten-thread-reply-button');
+      if (replyButton === null) throw new Error('Reply button not found.');
+      return replyButton;
+    }, {
+      interval: kOpenReplyEditorIntervalInMs,
+      timeout: kOpenReplyEditorTimeoutInMs,
+    });
+
+    const e = new Event('twpt-click');
+    replyButton.dispatchEvent(e);
+  }
+
+  async isFeatureEnabled() {
+    let options;
+    if (this.options !== null) {
+      options = this.options;
+    } else {
+      options =
+          await getOptions(['flattenthreads', 'flattenthreads_switch_enabled']);
+    }
+    return options['flattenthreads'] &&
+        options['flattenthreads_switch_enabled'];
+  }
+
+  getCurrentMessageId() {
+    const thread = parseUrl(window.location.href);
+    if (thread === false || thread.message === null) {
+      return null;
+    }
+    return thread.message;
+  }
+}