Telegram Web Viewer does not collect, transmit, sell, rent, or share personal data.

The extension runs only on https://web.telegram.org/. It changes page presentation locally in the browser so the user can collapse the left sidebar and enable wider message bubbles.

The extension declares "data_collection_permissions": { "required": ["none"] } in its Firefox manifest.

Data stored locally:
The extension stores local preferences using Firefox extension storage:
- whether the Telegram sidebar is collapsed
- whether wide messages mode is enabled
- the toolbar position, if the user drags it

These settings remain on the user's device and are not sent to the developer or to any third party by this extension.

Network access:
Telegram Web Viewer does not make network requests. The host permission for https://web.telegram.org/* is used only so the extension can inject its local CSS and JavaScript into Telegram Web.

Message content:
The extension does not read, store, transmit, or analyze Telegram messages. Its script queries page elements only to apply layout classes and CSS presentation changes.

Contact:
For privacy questions, contact the add-on publisher through the Mozilla Add-ons listing.