Web browsers have become bigger than ever in more ways than one. Yes, they have become practically central to the way we use computers but they've also become more complex as they gain new features. Web pages, too, have become more complex and browsers have to adjust to support them. Complexity always has a cost, however, and most of that cost is in performance. With the latest version 67 release of the Firefox browser, Mozilla is promising a faster experience not by trimming off the fat but by "procrastinating on purpose".