Firefox 157 has introduced a new user interface called Nova by default. According to the release notes for Firefox 157, this marks the most significant visual overhaul in several years. However, some users have not noticed a major difference in their daily use of the browser. Users who dislike the changes can revert to the old interface by adjusting a setting in about:config. To do this, they need to enter "about:config" in the address bar, accept the warning, and then look for the key "browser.nova.enabled." By setting this value to false, the old interface returns immediately, without needing to restart the browser. There is also a specific setting for the sidebar, "sidebar.revamp," which can be set to false to restore the old appearance. However, this will also disable vertical tabs, which could be a tricky choice for some users. Mozilla may remove these settings in the future once resistance to the new interface has decreased. For those who want to avoid any changes, an alternative browser based on Firefox called Floorp is available. Floorp offers a version of Firefox 157 without the Nova interface (for now).