Storage & Cookie Manager

A lightweight, modern browser extension to manage LocalStorage, SessionStorage, and Cookies. Built with Vanilla JavaScript and compatible with Manifest V3.

License Manifest Version

Edge Add-ons

Also compatible with Chrome, Brave, Opera, and other Chromium-based browsers via Developer Mode.

• Manage All Storage — View, edit, delete, and add entries for LocalStorage, SessionStorage, and Cookies.
• Modern UI — Clean, flat design with smooth animations, system fonts, and SVG icons.
• Inline Editing — Edit keys and values directly within the table with smart debouncing.
• JSON Viewer — Full-screen modal to view and format complex JSON values with syntax highlighting.
• Export & Import — Download storage data as JSON files or import from JSON text/file.
• Cookie Metadata — View full cookie details including domain, path, secure, httpOnly, sameSite, and expiration.
• Tab Animations — Sliding tab indicator and staggered About page entrance animation.
• Zero Dependencies — Pure Vanilla JS with no external libraries.
• Manifest V3 — Fully compliant with the latest Chrome/Edge extension standards.

1. Clone or download this repository.
2. Open your browser and navigate to chrome://extensions/ (or edge://extensions/).
3. Enable Developer mode (toggle in the top-right corner).
4. Click Load unpacked.
5. Select the folder containing the manifest.json file.

• Core: HTML5, CSS3, Vanilla JavaScript (ES6+)
• Architecture: Chrome Extensions API (Manifest V3)
• APIs Used: chrome.scripting, chrome.storage, chrome.cookies, chrome.tabs

Security

• XSS prevention in toast messages and HTML escaping with control character stripping.

Cookie Management

• Full cookie metadata preservation (domain, path, secure, httpOnly, sameSite, expiration) on edit/delete/export.
• Proper per-cookie URL construction for reliable cookie operations.
• Resilient bulk deletion with Promise.allSettled.

Stability

• Per-row debounced inline editing prevents orphan storage entries.
• Race condition fix in confirm dialog callbacks.
• DOM removal guards in async debounce handlers.
• FileReader error handling for import operations.
• Clipboard API promise handling with proper error feedback.

UX Improvements

• Sliding tab indicator animation.
• Staggered cascade entrance animation on About page.
• Escape key closes all modals.
• Focus state preserved across table rebuilds.
• Import data auto-reset when switching tabs.
• Empty data checks on Copy and Export actions.
• Readonly cookie inputs have no misleading focus ring.

Infrastructure

• Added missing storage permission.
• Preference stored in chrome.storage.local instead of popup localStorage.
• Replaced <form> wrapper to prevent unwanted page reloads.

• Initial release with LocalStorage, SessionStorage, and Cookie management.

This extension works 100% offline — no data is collected, transmitted, or shared. All operations happen locally in your browser. Read the full Privacy Policy.

This project is open source and available under the MIT License.