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## Overview Mozilla has formally registered opposition to Google Chrome's proposed "Prompt API," a browser-native interface intended to let web applications directly interact with on-device or browser-integrated AI models, via its standards-positions repository (GitHub, standards-positions issue #1213). ## Context The Prompt API is part of a wave of proposals to embed generative AI capabilities directly into browser platforms, alongside efforts like Gemini in Chrome's Skills feature. Mozilla's opposition signals disagreement over the standardization path, likely touching on concerns such as interoperability, privacy, vendor lock-in, specification maturity, or premature standardization of a fast-moving technology area (GitHub, standards-positions issue #1213). ## Why It Matters This is a notable instance of browser vendor conflict over how AI capabilities get baked into web standards — a strategically important battleground given browsers' role as the primary interface for most internet users. Historically, disputes over web standards (e.g., WebUSB, FLoC/Privacy Sandbox) have had lasting effects on the shape of the web platform and the balance of power between browser vendors. This dispute could shape whether AI features become an open, interoperable web standard or remain fragmented across proprietary implementations by Google, Mozilla, and others. ## Developments to Watch - Formal W3C or WHATWG standards body responses - Whether Apple/Safari or other browser vendors take a position - Chrome's response to Mozilla's objections and whether the API proceeds unilaterally - Downstream effects on web developers building AI-powered browser applications