Which carbon browser integrations come as standard to all users at no extra cost unlike other browsers?

Could you elaborate on the carbon browser integrations that are offered to all users as standard, without any additional fees, as opposed to other browsers in the market? I'm particularly interested in understanding what sets these integrations apart and how they contribute to a more eco-friendly browsing experience. Are there any specific features or tools that users can leverage to reduce their carbon footprint while surfing the web?