Enterprise work is increasingly happening in browsers, making them a primary target for cyberattacks. Current enterprise security, however, remains device-centric, failing to adequately protect browser sessions where most work and attacks occur. CloudMosa's Puffin Cloud Security addresses this by shifting browser execution to isolated cloud environments, thereby improving both performance and security. This architecture was initially developed to enhance browser performance and accessibility, anticipating the shift of enterprise work to the browser. The browser has evolved into the central operating environment for modern enterprise work, handling SaaS platforms, CRM systems, and AI workflows. This makes every open browser tab a potential entry point for malicious scripts and other browser-based exploits. Traditional detection-first security is proving insufficient against these attacks because malicious code often executes on the device before it can be detected. AI-generated malware further strains signature-based detection, creating new variants faster than defenders can respond. Puffin Cloud Security removes the attack surface by executing web code, including JavaScript and WebAssembly, in a disposable cloud environment and streaming only a pixel view to the user's device. This prevents exploits and malware from running on the endpoint. Puffin integrates with existing security infrastructure like SWG, CASB, and ZTNA, enhancing their capabilities rather than replacing them. This approach prioritizes endpoint isolation over faster detection, a critical shift given the rise of AI-enabled attacks. CloudMosa's "paranoid by design" philosophy ensures an architecture prepared for worst-case scenarios and increasingly sophisticated threats.