Great add-on for rss. Unfortunately it seems not working since last update(4.14.2 I guess), and the latest update(4.15.2) doesn't fix it for me.
The problem is that all feeds fail to update, but the "load" button in feed's properties return status "OK".
I'm on firefox version 110.0(64-bit) for ubuntu.

EDIT:
The problem is solved with the help of developers. It is caused by an incorrect entry at the top of feed lists with which Feedbro chokes and thus unable to update all other feeds. If similar problem occurs to you, try removing incorrect entry in your list if there's any.