Making the sandbox a priority was brought on, according to Michael Catanzaro, because he was particularly concerned with the code quality of OpenJPEG and the numerous security problems that had been discovered in it, including many years of failing security reviews by Ubuntu. He further explained that web compatibility requires that sites believe that Web is a major browser. Sending them the user agent of Apple Safari causes fewer broken websites than others (due to sharing the Webkit engine), but also causes caching servers to deliver JPEG 2000 images, of which Safari is the only major browser to support. There is no other usable open source option for JPEG 2000 support. Fixing OpenJPEG, which is the official reference software, will be a massive undertaking that could take years to sort out. Enabling the Bubblewrap Sandbox would cause many vulnerabilities in this and other components to become "minimally useful" to potential attackers.