# DjVu.js Viewer

> The extension is a local copy of the DjVu.js Viewer which is available on https://djvu.js.org/. It allows you to open links to .djvu files right in the browser and .djvu files from a local drive. Also, it processes tag with .djvu files.

Canonical page: [https://chrome-stats.com/d/djvu-js-viewer](https://chrome-stats.com/d/djvu-js-viewer)

## Overview

- **ID:** `djvu-js-viewer`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** RussCoder
- **Category:** download-management,appearance,other,tabs
- **Daily users:** 5,189
- **Weekly downloads:** 44
- **Rating:** 4.17 / 5 (23 ratings)
- **Version:** 0.10.0.0
- **Last updated:** 2023-12-28
- **First published:** 2018-05-01
- **Size:** 250 KB
- **Data as of:** 2026-09-10
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/djvu-js-viewer/)
- **Website:** [https://github.com/RussCoder/djvujs/issues](https://github.com/RussCoder/djvujs/issues)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/djvu-js-viewer/privacy/](https://addons.mozilla.org/firefox/addon/djvu-js-viewer/privacy/)

## Description

DjVu.js Viewer is a secure Chrome extension that enables you to open and view .djvu files directly in your browser, whether from online links or local storage. It supports processing of <embed> and <object> tags containing .djvu files, effectively replacing the need for Cuminas' native DjVu plug-in. Since all processing happens locally on your machine, it works offline and ensures complete privacy with no data collected or transmitted.

Based on the open-source DjVu.js library, this extension can bundle multi-file DjVu documents into one, delivering a smooth and integrated viewing experience for DjVu file formats. Its source code is freely available on GitHub, and users are encouraged to contribute by reporting any issues to further enhance the open-source project.

## Rankings

- #1,152 — Overall
- #90 — Tabs
- #104 — Download Management
- #171 — Other extensions
- #183 — Appearance
- #3 — viewer

## Permissions and access

### Permissions

- `storage`
- `webRequest`
- `webRequestBlocking`
- `<all_urls>`
- `contextMenus`

### Content script matches

- `*`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

Users find the DjVu.js Viewer useful for reading DjVu files directly within Firefox, especially helpful for those lacking admin rights. Pros include ease of use, functionality, and features like continuous scrolling. However, multiple users report issues with opening local files via file URLs, inability to set Firefox as the default local viewer, occasional failures, and lack of persistent settings like continuous scroll and zoom across sessions.

### Pros

- Allows reading DjVu files directly inside the Firefox browser without additional installations.
- Easy to use and works well for users without admin privileges.
- Receives positive feedback for functionality and usefulness in viewing DjVu files.
- Continuous scrolling mode and zoom features have been appreciated when available.

### Cons

- Cannot open local files directly via file URLs (file:///) without dragging and dropping.
- Lacks the ability to set Firefox as the default application to open DjVu files locally.
- Some users have experienced the add-on not working or failing to open files.
- Settings like continuous mode and zoom are not remembered between sessions for some users.

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Source: [Chrome-Stats](https://chrome-stats.com/d/djvu-js-viewer)