Firefox 148 has been released with a new 'AI kill switch' feature, allowing users to disable AI functionalities such as chatbot prompts and AI-generated link summaries. The update also includes enhancements to core web platform capabilities, improved screen reader compatibility, and new translation capabilities. Users can disable AI features by navigating to Settings > AI Controls and toggling the 'Block AI Enhancements' option. The update also focuses on user control over remote updates and data collection.