Hello! Usually, only people who are currently using this computer can see your browsing history and search history through Firefox. Firefox will not send your browsing and search history to Mozilla or anyone else. Unless you have logged into a Firefox account and enabled synchronization (in which case, data will only be synchronized between devices logged into the same account, and communication is encrypted). But you need to pay attention to: 1.If you haven't cleared your history, people who have access to your computer can see it through Firefox's "browsing history" and "search history". 2. Your internet service provider (ISP) and network administrator can see the websites and activities you visit If you value privacy, don't forget to clear your browsing history after each browsing session (or use privacy mode or VPN) Hope this helps!