A duplicate of this request: https://forums.opera.com/topic/64677/request-anthropic-claude-ai-services?lang=en-GB
Yes I'd love to see this too, but unfortunately Anthropic do not allow developers API access to Claude Plus so it can be integrated into tools. This can likely only be done with an Anthropic API account which isn't the same thing and most users wouldn't understand about signing up for that or understand the billing of it.
I have no use for the "add to bookmarks" icon because I use 3rd party bookmark tool.