[Bug-gnuzilla] Improved page for about:addons

[David Hedlund]

IceCat (and Abrowser) -> Tools -> Add-ons (about:addons) -> Get Add-ons 
-- this page uses https://trisquel.info/en/browser/addons but it really 
should use 
https://directory.fsf.org/wiki/Collection:IceCat?&printable=yes, I have 
maintained that list for about three years now.


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