Chrome Updates: New Developer Tools & Privacy Rules

During the Chrome Dev Summit, Google’s Chrome division unveiled a series of new features designed for developers, revised guidelines for extension creators, and further enhancements aimed at optimizing the browser’s overall efficiency.

Furthermore, the Chrome team announced a significant alteration concerning extension development: users will soon have more precise control over the websites an extension is permitted to access, anticipated to roll out sometime in 2021. Beginning in January, each extension listed on the Chrome Web Store will include a “Privacy practices” segment outlining the types of data it gathers.

Image Credits: Google

The Chrome team also communicated the launch of Manifest V3 in mid-January, coinciding with the release of Chrome 88 to the stable version. This update has been a source of concern for many extension developers—particularly those specializing in ad blockers. Manifest V3 introduces new restrictions for extension developers intended to limit their access to user data, but also imposes substantial constraints on how extensions can interact with webpages. Google states that it has incorporated feedback into V3, though further discussion on this topic is likely.

However, for the average user, perhaps the most encouraging news from today’s announcements is the ongoing effort to reduce the browser’s memory usage. Following earlier updates that decreased the overall memory footprint, the team is now focusing on the V8 JavaScript engine to minimize its memory consumption. Additionally, the team discovered methods to accelerate V8 and eliminate parsing delays by concurrently loading a site’s JavaScript files, ensuring their availability when a page initiates execution.

The team is also continually developing new methods to accelerate the browsing process. This is being achieved by modifying the way Chrome is compiled, a topic initially discussed earlier this summer when these changes appeared in the Chrome beta channel.

“By analyzing Chrome usage patterns and gaining insights into how users actually interact with the browser, we questioned whether we could improve Chrome’s efficiency through changes in its compilation process. The answer, we discovered, is yes,” explained Google’s Ben Galbraith. “[…] We refer to this as profile-guided optimization, and in [specific] instances, we observed up to a 10% improvement in page load times due to these compiler optimizations tailored to specific tasks.” While most scenarios show improvements in the 2-5% range, this represents a notable advancement considering the maturity of modern browser engines.

The team has also recently focused on refining tab throttling and resource allocation between foreground and background processes. Galbraith indicated that further development in this area is planned.

Developers will also gain access to new tools to enhance the performance of their web applications as part of Google’s Web Vitals initiative, which provides developers with key performance metrics to better understand user experiences. These core metrics will be integrated into Google Search rankings starting in May 2021. Google currently presents this data in the Chrome Experience Report, Search Console, and other platforms, and is now releasing an open-source Web Vitals Report tool to assist developers in creating custom visualizations based on Web Vitals data sent to Google Analytics. Currently, Google Analytics does not display this data within the context of Web Vitals, so developers can now utilize Google’s hosted tool or adapt the code for their own infrastructure.

Image Credits: Google

“When evaluating the various metrics, we are concentrating on aspects we understand best—loading performance, visual stability, and interactivity—ensuring that when a user clicks on something, a response occurs. The goal of these metrics is to accurately assess the quality of the user experience,” stated Google’s Dion Almaer.

Furthermore, Google continues to refine its Privacy Sandbox model. Two new experiments are being introduced: the Click Conversion Measurement API, designed to measure ad conversions without relying on cross-site identifiers, and the new Trust Token APIs, which enable a website to issue a cryptographic token to a trusted user. This token allows the browser to verify the user’s identity in other contexts, distinguishing them from bots or malicious actors.

In addition, new features are available for developers creating PWAs, updates to Chrome’s payment acceptance capabilities, and a range of other enhancements.

Image Credits: Google