fix: open the dedicated Reddit Chat host

extensions/reddit-session-exporter/README.md

@@ -7,7 +7,7 @@ This local Chrome extension exports `reddit.com` cookies and the current Reddit
 1. In Chrome, open `chrome://extensions`, enable **Developer mode**, then choose **Load unpacked** and select this folder.
    If it was already loaded, click its **Reload** button after updating these files so Chrome starts the new service worker.
 2. Sign in to Reddit in the same Chrome profile.
-3. Open [Reddit Chat](https://www.reddit.com/chat/) and wait for it to finish loading. The extension badge changes to `OK` when it captures the Matrix credential.
+3. Open [Reddit Chat](https://chat.reddit.com/) and wait for it to finish loading. Do not use `www.reddit.com/chat/`: its Matrix bridge can return HTTP 405. The extension badge changes to `OK` when it captures the Matrix credential. If no credential has been captured yet, clicking the extension opens the correct Chat host automatically.
 4. Click the **RedditBot Session Exporter** toolbar icon and save `redditbot-session.json`.
 5. In RedditBot Dashboard > Settings > Access, choose **Import Reddit session** and select the exported file.
 6. Delete the downloaded JSON file once the dashboard confirms that the session is authenticated.

extensions/reddit-session-exporter/manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
   "name": "RedditBot Session Exporter",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "description": "Exports Reddit cookies and Reddit Chat credentials for a self-hosted RedditBot dashboard.",
   "permissions": ["cookies", "downloads", "storage", "webRequest"],
   "host_permissions": [

extensions/reddit-session-exporter/service-worker.js

@@ -1,6 +1,7 @@
 import {
   assertMatchingSessionIdentity,
   createSessionExportDownload,
+  REDDIT_CHAT_URL,
 } from './session-export.js';
 
 const MATRIX_URLS = [
@@ -64,7 +65,13 @@ chrome.action.onClicked.addListener(async () => {
     const cookies = await chrome.cookies.getAll({ domain: 'reddit.com' });
     const { matrixCapture } = await chrome.storage.local.get('matrixCapture');
     if (!matrixCapture) {
-      throw new Error('Open Reddit Chat, wait for it to load, then click the extension again.');
+      await chrome.tabs.create({ url: REDDIT_CHAT_URL });
+      await chrome.action.setBadgeText({ text: '...' });
+      await chrome.action.setBadgeBackgroundColor({ color: '#6c757d' });
+      await chrome.action.setTitle({
+        title: 'Reddit Chat opened. Wait for the badge to show OK, then click again.',
+      });
+      return;
     }
 
     const whoami = await fetch(`${matrixCapture.homeserver}/_matrix/client/v3/account/whoami`, {

extensions/reddit-session-exporter/session-export.js

@@ -1,4 +1,5 @@
 const REDDITBOT_SESSION_FILENAME = 'redditbot-session.json';
+export const REDDIT_CHAT_URL = 'https://chat.reddit.com/';
 
 export function normalizeRedditAccountId(accountId) {
   const trimmed = String(accountId ?? '').trim();

tests/reddit-session-exporter.test.ts

@@ -2,8 +2,13 @@ import { describe, expect, it } from 'vitest';
 import {
   assertMatchingSessionIdentity,
   createSessionExportDownload,
+  REDDIT_CHAT_URL,
 } from '../extensions/reddit-session-exporter/session-export.js';
 
+it('uses the dedicated Reddit Chat host for Matrix credential capture', () => {
+  expect(REDDIT_CHAT_URL).toBe('https://chat.reddit.com/');
+});
+
 describe('createSessionExportDownload', () => {
   it('creates a JSON data URL that Chrome can download from a service worker', () => {
     const download = createSessionExportDownload([