[Bug-gnuzilla] Adding free IceCat extension to list of free extensions

[Cosimo Agati]

I'd like to point out the extension uBlock Origin: 
https://github.com/gorhill/uBlock

As you can see from the website it is explicitly released under the 
GPLv3, but it's not included in your list: 
https://www.gnu.org/software/gnuzilla/addons.html .

I strongly suggest you include this extension in the list, since it 
provides similar functionality to AdBlock Plus, but it does not leave 
"acceptable ads" unblocked by default. It also seems to have a lower 
memory footprint.

Best regards.

Cosimo Agat