# Page Not Found

The URL `_next/static/chunks/1285-896a4c72a9521810.js` does not exist.

You might be looking for one of these pages:
- [Contacts](https://developer.thunderbird.net/thunderbird-development/codebase-overview/chat/contacts.md)
- [Chat Core Protocols](https://developer.thunderbird.net/thunderbird-development/codebase-overview/chat/chat-core-protocols.md)
- [Adapt to Changes in Thunderbird 79-91](https://developer.thunderbird.net/add-ons/updating/tb91/changes.md)
- [Adapt to Changes in Thunderbird 69-78](https://developer.thunderbird.net/add-ons/updating/tb78/changes.md)
- [Adapt to Changes in Thunderbird 61-68](https://developer.thunderbird.net/add-ons/updating/tb68/changes.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://developer.thunderbird.net/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://developer.thunderbird.net/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/thunderbird-development/codebase-overview/chat/contacts.md`)
- Use `Accept: text/markdown` header for content negotiation