Dashlane -  Password Manager.

Sticky Password - Password Manager.

DuckDuckGo Privacy Essentials Protect your data as you search and browse.Protect your data as you search and browse.

Privacy Badger -  Privacy Badger automatically learns to block invisible trackers.

LastPass - Password Manager.

Watch Your Hack -  Fantastic guide about security, this is a MUST READ.

Password-alert - Password Alert helps protect against phishing attacks.

uBlock Origin -  Ad Blocker.

Have I Been Pwned? - Check if you have an account that has been compromised in a data breach.