This is my new work I wrote in the last month. It was just released.
Overview
A concise, lightweight and high-performance Transmission Manager and Web Extension. It supports managing multiple remote or local Transmission at the same time, as well as adding magnet links from BitTorrent websites.
Features
Concise, lightweight and high-performance: Removed some not commonly used functions; The installation package size is small; Fast page loading, low CPU and memory usage.
Support simultaneous management of download tasks in multiple remote Transmissions.
Support adding download tasks by right-clicking on magnet links in Web pages.
This extension doesn't require "Read and change all your data on all websites" permission.