MirrorTab, a San Francisco startup building technology to neutralize malicious attacks at the browser layer, has secured $8.5 million in seed funding led by Valley Capital Partners.
The round, which also included GV, Ludlow Ventures, Altman Capital Fund, NextGen Venture Partners, and Alumni Ventures, underscores mounting investor interest in so-called “browser isolation” technologies — tools designed to protect both enterprises and end users from web-based threats.
Unlike traditional browser security products that shift user traffic through dedicated cloud servers, MirrorTab positions itself on the application side, intercepting and sanitizing a browser session before it ever reaches the customer’s device. The company argues this eliminates the traditional client-side attack surface — malware, malicious scripts, or compromised browser extensions — by preventing raw code or sensitive data from being exposed in the user’s environment.
“Using isolation technology, MirrorTab removes the browser as an attack surface, obfuscating data, code, and Application Programming Interfaces (APIs) to establish the most secure web sessions. This ensures that sensitive business, personal and financial information can be shared with confidence,” the company said in a statement announcing the new financing.
According to MirrorTab advisor Allison Miller, former CISO of Reddit, the MirrorTab technology “creates a secure, bot-proof wrapper” around sensitive web sessions. The company says that even if a customer’s device is infected, the session is still isolated from malicious code, providing an advantage that could resonate with financial services, e-commerce, and government agencies increasingly worried about client-side attacks such as Magecart or formjacking.
“Browsers have become the battleground for hacking, bots, and malware,” said Brian Silverstein, CEO and founder of MirrorTab, noting that modern cyberattacks are leveraging browsers, AI and automation to evade detection, mimic human-like behavior, and execute attacks that cannot be prevented with typical web security controls.
MirrorTab plans to use the seed capital to expand its platform capabilities and partnerships with existing security stacks like web application firewalls (WAFs) and bot management tools.
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