Project Manager by Lunu

This project offers an offline to-do list with search and tag support. The user can use the built-in search engine of the extension to find the submitted issues.

Features:
Works offline
Supports multiple projects
Search among all projects
Has Gmail-liked tagging buttons: "Mark as Read", "Mark as Flagged", and "Mark as Pinned"
Supports user-defined tags

Privacy Policy:
This extension does not send anything to any server whatsoever. It works locally and stores notes locally.