Exactly what I need

This isn't actually Claude integrated with your browser - like Claude can't see whatever webpage you're on. It is not like the Chrome extension (official Anthropic one). All this does is give you a Claude chat thread on the side of your browser. I gave it 2 stars because it's not totally fake, it does surface your legitimate Claude account, but it's not integrated with your browser in any meaningful way.

In Firefox fork "Floorp" (Linux) I get an empty sidebar when I click the Claude symbol.

Probably fake/malware anyway, since it is known that Anthropic never offered Claude web services.

This is fake! Is a sidebar app but can not "see" your browser tab! I it not integrated at all!
Is totally fake!