---
type: entity
title: NC Connector
tags: [extension, thunderbird, nextcloud]
related: [mozilla-thunderbird, nextcloud]
created: 2026-06-30
updated: 2026-06-30
sources: ["output/rz_uni_greifswald_de_dienste_allgemein_e_mail_e_mail_einrichten_mozilla_thunderb.md"]
---

# NC Connector

**NC Connector** is a Mozilla Thunderbird extension designed to integrate the email client with a Nextcloud instance to manage large file attachments.

## Functionality
The extension monitors the size of files added as attachments to an email. If a file exceeds a configured size limit, the NC Connector automatically:
1. Uploads the file to the user's **Nextcloud** storage.
2. Generates a shareable download link.
3. Inserts that link into the email body, replacing the physical attachment.

## Technical Requirements & Configuration
- **Version:** Version 3.0.3 or higher is required to ensure stability and bug fixes.
- **University Setup:** For Universität Greifswald users, the server URL is configured as `https://nextcloud.uni-greifswald.de`.
- **Authentication:** Supports automatic loading of app passwords via a browser-based OAuth-like login flow.
- **Compatibility Note:** To avoid functional conflicts, the native Thunderbird "Offer to upload files larger than 5MB" feature must be disabled in the client's composition settings.

## Distribution
The extension is distributed as an `.xpi` file, available via [[github]].
