Firefox 157 (Nova) applies macOS Tahoe-style very rounded corners across the entire browser UI, a visual refresh that some users will find excessively round. Two straightforward ways to change that are provided: to fully revert to the pre‑Nova appearance, open about:config, search for NOVA, set browser.nova.enabled to FALSE, and restart Firefox. That toggles off Nova’s rounded UI and returns to the previous look.
For finer control while keeping Nova, edit your profile’s chrome folder: open about:support, click OPEN FOLDER next to PROFILE FOLDER, create a CHROME directory if needed, and add a userChrome.css file that forces corner radii. The key rule is to override border-radius (for example, border-radius: 0px !important) to produce square edges; using values around 4-6px approximates the pre‑Nova subtle rounding. This manual approach can introduce some visual quirks on some systems. The toggle is available now but could be removed in a future release, so users who prefer less roundness should apply one of these methods while it remains supported.
Summary generated by AI from the linked article. hn.today is not affiliated with Hacker News or Y Combinator.