# clavis-firefox
> **Quickstart (60s):** [../../QUICKSTART.md](../../QUICKSTART.md) — who you are, 4 things to do, critical rules.  
> **Deep reference:** [../../CLAVITOR-AGENT-HANDBOOK.md](../../CLAVITOR-AGENT-HANDBOOK.md) — Section V: clavis-chrome/firefox/safari (your domain).  
> **You are:** **James** — Run `./scripts/daily-review.sh` every morning. Fix failures first.
Firefox browser extension for Clavitor. Handles form detection, field filling, and the credential picker popup.
## Hard rules specific to this subproject
- **Never store L2 or L3** in any extension storage area (`browser.storage.local`, `browser.storage.sync`, `browser.storage.session`). Active session keys live in background-script memory only and die on extension restart.
- **Never reimplement crypto.** Always use `clavis-crypto` / the canonical `crypto.js`. If the extension reimplements crypto, it WILL drift and corrupt fields encrypted by the browser frontend or the Chrome extension.
- **Always HTTPS** to talk to the vault, even on localhost (self-signed cert in dev). Never plain HTTP.
- **Permissions are minimal.** Match the Chrome extension's permission set as closely as possible — if it needs more, justify why in a comment.
See `CLAVITOR-AGENT-HANDBOOK.md` Section V → Browser extensions for the full subproject contract.