session-defense
(2)
MirrorTab
MirrorTab is a San Francisco cybersecurity startup that stops browser-based attacks by moving the browser session server-side. Its isolation technology intercepts and sanitizes a web session at the edge before it ever reaches a user's device, so malware, malicious extensions, bots, and AI-driven automation never touch the application's code, data, or APIs. Founded in 2021 by Honey co-founder Brian Silverstein, the company raised an $8.5M seed round led by Valley Capital Partners in February 2025 and targets financial services, e-commerce, and government.
Brian Silverstein
Brian Silverstein is the founder and CEO of MirrorTab, a San Francisco cybersecurity company that treats the browser as the new battleground and tries to take it off the table entirely. Using server-side isolation, MirrorTab strips the client-side attack surface so malware, malicious extensions, and bots never touch the real code, data, or APIs behind a web session. Before MirrorTab he was an early co-founder and CTO of Honey, the shopping-rewards browser extension acquired by PayPal, and an engineer at Apple, Nest, Broadcom, and Freescale. A Cornell-trained electrical engineer with eight patents, he raised an $8.5M seed in 2025 led by Valley Capital Partners with GV and others.