EPUB Ninja - eBook Reader — Digital Fracture

EPUB Ninja is a clean, distraction-free eBook and comic reader that lives in your Firefox 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

1. Click the EPUB Ninja icon in your toolbar to open the sidebar.
2. Click "Import EPUB / CBZ" and select your files.
3. 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