This local Chrome extension exports reddit.com cookies and the current Reddit Chat Matrix credential into one JSON file for the self-hosted dashboard's Import Reddit session control. The file is equivalent to a login credential: do not share it, commit it, or send it to anyone.

Install and use

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.
Sign in to Reddit in the same Chrome profile.
Open Reddit Chat and wait for it to finish loading. The extension badge changes to OK when it captures the Matrix credential.
Click the RedditBot Session Exporter toolbar icon and save redditbot-session.json.
In RedditBot Dashboard > Settings > Access, choose Import Reddit session and select the exported file.
Delete the downloaded JSON file once the dashboard confirms that the session is authenticated.

The extension observes only requests to Reddit's Matrix homeservers, verifies the captured token with Matrix whoami, reads Reddit cookies, and saves the combined export locally. It does not send the dump to any server; you upload it directly to your RedditBot dashboard.