uProxy - Internet without borders. A safer path to Internet.
Cookie Manager - This Cookie Manager allows you to quickly view and edit specific cookies.
Gravity scan - Free malware and vulnerability scanner
Cookiebro - With Cookiebro you can manage/filter/block browser cookies that can be used to track you online.
Marshal - Quickly scan your cloud for exposed sensitive information.
Cookie Quick Manager - An addon to manage cookies (view, search, create, edit, remove, backup, restore, protect from deletion and much more). Firefox 57+ is supported.