On an addon page on https://addons.mozilla.org try right-clicking on the button "Install extension" to get a contextual menu, copy the link, paste it it the address bar and visit that address. I believe Abrowser/IceCat spoofs the user agent to fight against fingerprinting. That is why https://addons.mozilla.org believes your version of the browser is not high enough.

If you want completely different profiles: https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

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