LeechBoard by DrunkTrader

Leechboard is a local-first browser extension that puts a focused, whiteboard beside coding problems on LeetCode, CodeChef, and Codeforces.

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About this extension

Leechboard is a local-first browser extension that puts a focused, Excalidraw-like whiteboard beside coding problems on LeetCode, CodeChef, and Codeforces.

It is designed for the moment when a solution needs a quick sketch: draw a graph, annotate a recurrence, trace an array, or leave a note for later. Boards are isolated per problem and stored in the browser profile. No account, backend, analytics, or remote content is required.

Author: drunktrader

Chrome and Firefox MV3 builds from one TypeScript codebase.
A Shadow DOM overlay that does not modify the host site's layout.
Freehand strokes, lines, arrows, rectangles, ellipses, text, sticky notes, and semantic DSA components.
Reusable components for arrays, linked lists, stacks, queues, binary trees, graphs, pointers, and complexity notes.
Per-problem autosave, restore, delete, import, and export.
Separate board identity for each supported problem URL, including Codeforces contest/gym routes and CodeChef contest routes.
Keyboard-first controls, visible focus, reduced-motion support, and a polite save-status announcement.
Local-only privacy posture with minimal permissions.

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Permissions and data

Required permissions:

Access your data for codechef.com
Access your data for codeforces.com
Access your data for leetcode.com
Access your data for www.codechef.com
Access your data for www.leetcode.com

Optional permissions:

Access your data for leetcode.com
Access your data for www.leetcode.com
Access your data for www.codechef.com
Access your data for codechef.com
Access your data for codeforces.com

Data collection:

The developer says this extension doesn't require data collection.