Sorry about that, but I've never tested this plugin in other browsers. The recommendation is to use Mozilla Firefox. Since this is an open-source project, you can contribute to improving it even more and making it compatible with other browsers.
You can find the repository at https://github.com/muriloportugal/DelugeAddTorrent.

Hi, thanks for sharing.
The initial ideia of this project was not take any personal data of users, a few people use deluge in a remote server (cloud), if this users has, for some reaseon, their computer compromised, other person can take the URL and the password of deluge server.
We know that are great tools to deluge that you can share your password with, but this one was built for those who don't want to share their password with a third party.
We're sorry we didn't meet your expectations, but we're glad you found another tool that can help you.

Thank you. I hope you enjoy my work, and if you have any problem or suggestions please let-me know.