Web-automation start-up Browserbase has raised $40 million in a Series B round that values the 15-month-old company at about $300 million. The financing was led by Notable Capital, with participation from Kleiner Perkins and Outset Capital, bringing Browserbase’s total funding to $67.5 million. The San Francisco-based company also introduced Director, a service that enables non-developers to run headless browser sessions, expanding the reach of its platform that lets artificial-intelligence agents and software teams interact with the web. Browserbase says its technology has powered more than 50 million browser sessions so far this year and attracted over 20,000 developer sign-ups and 1,000 paying customers, including Commure, 11x and Perplexity. Founder and Chief Executive Officer Paul Klein IV said the fresh capital will be used to scale infrastructure and accelerate product development as demand grows for tools that allow AI agents to automate online tasks.