EPUB Ninja - eBook Reader :: ਇਕਸਟੈਨਸ਼ਨ ਪੇਸਕਸ਼

EPUB Ninja is a clean, distraction-free eBook and comic reader built for Thunderbird. Import your EPUB and CBZ files, and start reading no cloud, no tracking.

FEATURES

• Built-in eBook Reader: Read EPUBs right inside Thunderbird. No separate app needed.
• CBZ Comic Support: Import comic book archives with single page, two-page spread, fit page, fit width, and fullscreen viewing modes.
• Split-Pane Layout: Your library on the left, your book on the right — read without leaving Thunderbird.
• Book Library: Manage your collection with cover art, reading progress, and sort by recent, title, or
progress.
• Dark & Light Themes: Full dark mode that themes the entire Thunderbird chrome to match.
• Table of Contents: Slide-out chapter navigation. Jump to any section instantly.
• Bookmarks: Bookmark any chapter and return to it with one click.
• Full-Text Search: Search across every chapter of your book.
• Reader Settings: Font size, font family, line height, margins, text alignment, and paragraph spacing.
• Keyboard Navigation: Arrow keys to navigate, W to toggle fit modes, 1/2 for page modes, Escape to close
panels.
• Reading Progress: Automatically saved. Close Thunderbird and pick up exactly where you left off.
• 100% Local: All data stored in your browser. Books never leave your device. No servers, no uploads, no
tracking.

SUPPORTED FORMATS

• EPUB 2 and EPUB 3 (eBooks)
• CBZ (Comic Book ZIP archives)

HOW IT WORKS

1. Click the EPUB Ninja icon in your Thunderbird toolbar.
2. Click "Import EPUB / CBZ" and select your files.
3. Click a book to start reading in the right-hand panel.

Your books are stored locally in browser storage. Nothing is sent anywhere.

Part of the Ninja suite from the makers of RSS Ninja.

Website: https://rssninja.co.uk

1.0.1
- Fixed theme conflict when running alongside RSS Ninja - theme now only applies on explicit user toggle
- Fixed tab detection matching other ninja extension tabs by using extension-specific URL prefix

Privacy Policy

Last updated: January 2026
Overview

RSS Ninja is committed to protecting your privacy. This policy explains how we handle data when you use our Firefox browser extension.

The short version: Your data stays on your device. We don't collect, store, or sell your personal information.
Data Storage

RSS Ninja stores all your data locally in your browser using Firefox's built-in storage APIs:

Feed subscriptions - The RSS/Atom feeds you subscribe to
Categories - How you organise your feeds
Read states - Which articles you've read
Starred articles - Articles you've saved
Preferences - Your view mode and theme settings

This data never leaves your browser unless you explicitly export it.
What We Don't Collect

We do not collect:

Your browsing history
The feeds you subscribe to
The articles you read
Analytics or tracking data
Personal information of any kind

Network Requests

RSS Ninja makes network requests only to:

Fetch RSS/Atom feeds - Directly from the feed URLs you provide
Authentication - To our auth server (rssninja.co.uk) when you sign in

We do not proxy your feed requests through our servers. Your browser fetches feeds directly from their sources.
Authentication

When you create an account, we store minimal information required for authentication:

Email address
Display name (if provided)
Account creation date

This information is stored securely and is never shared with third parties.
Cookies

RSS Ninja uses session cookies solely for authentication purposes. We do not use tracking cookies or third-party analytics.
Third-Party Services

RSS Ninja does not integrate with any third-party analytics, advertising, or tracking services.
Data Deletion

You can delete all your local data at any time by:

Using the export/clear function in the extension
Uninstalling the extension
Clearing your browser's extension data

To delete your account, please contact us at the email below.
Changes to This Policy

We may update this privacy policy from time to time. We will notify users of any significant changes through the extension or our website.
Contact

If you have questions about this privacy policy, please contact us at our contact page.

Some add-ons ask for permission to perform certain functions (example: a tab management add-on will ask permission to access your browser’s tab system).

Since you’re in control of your Thunderbird, the choice to grant or deny these requests is yours. Accepting permissions does not inherently compromise your browser’s performance or security, but in some rare cases risk may be involved.

ਐਡ-ਆਨ

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EPUB Ninja - eBook Reader 1.0.1

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ਵਰਜਨ 1.0.1 ਜਾਰੀ ਹੋਇਆ ਅਪ 6, 2026 1.4 MiB ਨਾਲ ਕੰਮ ਕਰਦਾ ਥੰਡਰਬਰਡ 128.0 and ਬਾਅਦ