

All of the extensions on the Firefox Addon website seem to install fine in IceCat. The extensions will be updated automatically. I recommend after installing IceCat disable all of the extensions that come with it built in or websites won’t load as expected.
There are things only sold on Amazon because that’s where the global mass market is. Even though Amazon does not have a site for every individual country, which other shopping website deliveries to almost every single country? If you want to replace Amazon, spend $5 billion to develop a competitor.