css at-rule()

Firefox 157 (29 Sep 2026): 76 security fixes, CSS changes

Mozilla’s Firefox 157 (29 Sep 2026) brings a visual refresh, native dialogs that match a page’s light or dark scheme, CSS at-rule() and overscroll chain, and 76 CVEs in MFSA 2026-97. Sourced from Mozilla pages; nothing installed; no affiliate.