Ever wondered what happens to your chats with AI assistants? Do they remember your secrets? The truth is, your prompts—those questions and commands you type—are often stored and shared. This raises serious privacy concerns, especially when third-party plugins are involved, giving external services access to your personal data. Researchers have developed a clever solution called Casper. Think of it as a privacy guardian for your AI interactions. It's a browser extension that acts like a filter, sanitizing your prompts before they reach the AI. Casper uses a three-pronged approach. First, it scans for and redacts sensitive info like phone numbers and addresses using pre-defined rules. You can even customize these rules. Second, it uses machine learning to detect named entities, like people and places, replacing them with pseudonyms. Finally, a local, smaller AI model on your device identifies privacy-sensitive topics, like medical or legal issues, and warns you before sharing them. The best part? Casper works behind the scenes. It preserves the functionality of the AI while keeping your secrets safe. It’s a critical step towards ensuring a future where we can benefit from AI's power without sacrificing our privacy.