Which of the following is NOT a feature of a web browser?

A web browser is primarily designed to retrieve, present, and traverse information on the World Wide Web. Its core functions involve a user interface that allows users to interact with web content, a rendering engine that processes HTML, CSS, and other resources to display web pages correctly, and a JavaScript interpreter which executes JavaScript code that enables dynamic features on web pages.

File compression tools, however, are not inherent features of a web browser. While some browsers may provide limited support for handling compressed files or might use compression methods for data transfer (like Gzip), they do not include built-in features specifically designed for compressing and decompressing files in the way that dedicated software programs do.

Thus, file compression tools are not a core functionality of web browsers, distinguishing them from the other options listed, which are essential aspects of how a browser operates.