RSS Ninja

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

FEATURES

• Sidebar eBook Reader: Read EPUBs right inside Firefox. No separate app needed.
• CBZ Comic Support: Import comic book archives with single page, two-page spread, and fullscreen viewing modes.
• 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 browser 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, F for fullscreen, 1/2 for page modes, Escape to close panels.
• Reading Progress: Automatically saved. Close the browser 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

Click the EPUB Ninja icon in your toolbar to open the sidebar.
Click "Import EPUB / CBZ" and select your files.
Click a book to start reading.

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

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

Website: https://rssninja.co.uk

1.0.4
- Fixed theme conflict when running alongside EPUB 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
1. Introduction

Digital Fracture ("we", "our", or "us") is committed to protecting your privacy and ensuring you have a positive experience when using our products and services.

This Privacy Policy explains what information we collect, how we use it, and your rights regarding your personal data. This policy applies to our website (digitalfracture.co.uk), browser extensions, and all related services.
2. Who We Are

Digital Fracture is a UK-based software development company that creates browser extensions, web applications, and developer tools. We are the data controller for any personal information collected through our services.

Website: digitalfracture.co.uk
3. Information We Collect
Information You Provide

Contact Information - Name, email address, and message content when you use our contact form
Support Requests - Any information you provide when seeking technical support
Feedback - Comments, suggestions, or reviews you submit

Information Collected Automatically

Technical Data - Browser type, operating system, and device type for compatibility
Usage Data - Pages visited, time spent on site, and referring URLs (anonymised)
IP Address - May be logged temporarily for security and fraud prevention

Information We Do NOT Collect

Payment or financial information (we do not sell products directly)
Sensitive personal data (health, religious beliefs, etc.)
Browsing history from our browser extensions

4. How We Use Your Information

We use the information we collect for the following purposes:

To respond to your enquiries and provide customer support
To improve and develop our products and services
To ensure our website and services function correctly
To detect and prevent fraud, abuse, or security issues
To comply with legal obligations
To send important updates about our services (only if you've contacted us)

5. Legal Basis for Processing (GDPR)

Under UK and EU data protection law, we process your personal data on the following legal bases:

Consent - When you submit a contact form or opt-in to communications
Legitimate Interests - To improve our services and ensure security
Legal Obligation - When required by law to retain or disclose information
Contract - To provide services you have requested

6. Cookies and Local Storage

Our website uses minimal cookies and local storage:

Theme Preference - Stores your dark/light mode preference locally
Essential Cookies - Required for basic website functionality

We do NOT use tracking cookies, advertising cookies, or third-party analytics that identify individual users.
7. Data Sharing and Third Parties

We do not sell, rent, or trade your personal information.

We may share information only in these limited circumstances:

Service Providers - Hosting providers who help us operate our website (bound by confidentiality)
Legal Requirements - When required by law, court order, or government request
Protection - To protect our rights, privacy, safety, or property

8. Data Security

We implement appropriate technical and organisational measures to protect your personal data, including:

HTTPS encryption for all data transmission
Secure hosting with regular security updates
Limited access to personal data on a need-to-know basis
Regular review of our security practices

9. Data Retention

We retain your personal information only for as long as necessary:

Contact form submissions - Up to 12 months
Support requests - Up to 24 months for reference
Server logs - Up to 30 days

You may request earlier deletion at any time by contacting us.
10. Your Rights

Under UK GDPR and data protection law, you have the following rights:

Right of Access - Request a copy of the personal data we hold about you
Right to Rectification - Request correction of inaccurate or incomplete data
Right to Erasure - Request deletion of your personal data
Right to Restrict Processing - Request limitation of how we use your data
Right to Data Portability - Receive your data in a portable format
Right to Object - Object to processing based on legitimate interests
Right to Withdraw Consent - Withdraw consent at any time when processing is based on consent

To exercise any of these rights, contact us via our website. We will respond within 30 days.
11. Children's Privacy

Our services are not directed at children under 13 years of age. We do not knowingly collect personal information from children. If you believe we have collected information from a child, please contact us immediately and we will delete it.
12. Browser Extensions

This section applies to all Digital Fracture browser extensions, including Fingerprint Defender, RSS Kit, and any future extensions we publish.
No Data Collection

Our browser extensions do not collect any data. Specifically, they:

Do NOT collect personal information
Do NOT track your browsing activity or history
Do NOT send any data to our servers or third parties
Do NOT use analytics, telemetry, or tracking
Do NOT access or store passwords, form data, or sensitive information

Local Storage Only

Extensions store your preferences locally in your browser using the browser's storage API:

Data never leaves your device
Only accessible by the extension itself
Deleted when you uninstall the extension or clear browser data
Not synced to any external service

Permissions Explained

Our extensions request only the minimum permissions necessary:

storage - Save your preferences locally on your device
tabs / activeTab - Interact with browser tabs when required by functionality
host permissions - Run extension features on web pages (all processing is local)

Each extension's specific permissions are detailed on its browser store listing.
13. International Data Transfers

Our servers are located in the UK/EU. If any data is transferred outside these regions, we ensure appropriate safeguards are in place in accordance with UK GDPR requirements.
14. Changes to This Policy

We may update this Privacy Policy from time to time to reflect changes in our practices or legal requirements. Any changes will be posted on this page with an updated revision date. We encourage you to review this policy periodically.
15. Complaints

If you are unhappy with how we have handled your personal data, you have the right to lodge a complaint with the Information Commissioner's Office (ICO):

Website: ico.org.uk
Phone: 0303 123 1113
16. Contact Us

If you have any questions about this Privacy Policy or wish to exercise your rights, please contact us via our website:

Contact Digital Fracture

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.

Add-ons

Welcome to Thunderbird Add-ons.

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RSS Ninja 1.0.4

by Digital Fracture

About this Add-on

Version Information

Version 1.0.4 Released April 6, 2026 995.9 KiB Works with Thunderbird 128.0 and later

Add-ons

Welcome to Thunderbird Add-ons.

On the go?

RSS Ninja 1.0.4

by Digital Fracture

About this Add-on

Version Information

Version 1.0.4 Released April 6, 2026 995.9 KiB Works with Thunderbird 128.0 and later

Privacy Policy

Permissions

This add-on can:

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