form-safe

Prevents accidental tab/window close when filling out forms.

form-safe is a tiny, open-source extension that prevents accidental navigation while you are filling out forms. It monitors input, textarea, and select elements; if it detects user interaction it enables the browser's native before-unload dialog so accidental tab or window closes prompt the user to confirm. The guard is automatically removed when the form is submitted or reset. No data is collected or transmitted — everything runs in the user's browser.