Chrome 78, released on October 22, 2019, introduces several exciting features for developers, including CSS opacity percentages, JavaScript optional chaining, and updates to the Internationalization API. The version enhances user experience by restricting certain dark patterns, improving scroll precision, and adding the User Timing Level 3 API for performance measurement. Additionally, the Payment Request API is updated to improve transaction consistency, while the new WebSocketStream offers improved data handling over its predecessor. Chrome 78 also introduces experimental features like the Native File System API and SMS Receiver API, which facilitate direct file interaction and automated SMS handling, respectively. Despite these advancements, many features are experimental and may change or be unsupported in other browsers.