"Display unreads notifications" checkbox doesn't work

[tzinm]

Hello!

The Display unreads notifications checkbox doesn't work. After unchecking it, you reopen the extension options and it appears checked.

In addition, it would be interesting if the extension only notified when there are new feeds. In this moment, it notifies whether there are or not new unread feeds.

My Web Browser

• Firefox for Fedora 84.0.2 (64-bit)
• Firefox for Windows 84.0.2 (64-bit)

Despite this small inconvenience, the extension works really well.

Thank you for your job!