[Bug-gnuzilla] Extension: Feedbro cannot be installed

[Dino Conte]

Unfortunately the Feddbro Feed-Reader 
(https://addons.mozilla.org/en-US/firefox/addon/feedbroreader/) does not 
work with IceCat.

Do you have any tips for an alternative, or how I can activate the 
extension?

Many greetings
Dino