freighter

Comprehensive best practices for the Freighter browser extension. Covers code style, architecture, security, testing, performance, error handling, i18n, messaging, git workflow, dependencies, and anti-patterns. Use when writing new features, reviewing PRs, adding message handlers, working with Redux, modifying content scripts, handling keys, building transactions, or any development work in the freighter extension repo. Triggers on any task touching the freighter codebase.