Extension is called ‘Fire Shield Extension Protection’, saved you a click.

edit: full list

Cuponomia – Coupon and Cashback (700,000 users, public)

Fire Shield Extension Protection (300,000 users, unlisted)

Total Safety for Chrome™ (300,000 users, unlisted)

Protecto for Chrome™ (200,000 users, unlisted)

Browser WatchDog for Chrome (200,000 users, public)

Securify for Chrome™ (200,000 users, unlisted)

Browser Checkup for Chrome by Doctor (200,000 users, public)

Choose Your Chrome Tools (200,000 users, unlisted)