... tokens (e.g., "John Smith" [NAME_1]) - Uses regex, Shannon entropy analysis (for API keys), and lightweight NLP - Everything runs 100% locally in your browser no data ever leaves your machine The hardest technical challenge was working inside ChatGPT's ProseMirror editor, which silently reverts any direct DOM mutations. Ended up using the CSS Custom Highlight API to paint highlights without touching the DOM. Built with Plasmo, TypeScript, React. Available on Chrome Web Store now, Firefox version pending review ... ... trust a tool like this? Website: https://prompt-armour.vercel.app Chrome Web Store: https://chromewebstore.google.co... Comment from Rian Robertson(@rianbrob): Hey Apoorva, this is seriously cool...100% local PII redaction in chatbots solves a huge blind spot, and that ProseMirror