Mozilla sent Firefox Version 138.0.4 to the Release Channel with two critical security updates.
Fixed
- #CVE-2025-4920: Out-of-bounds access when resolving Promise objects
- #CVE-2025-4921: Out-of-bounds access when optimizing linear sums
Update: To get the update now, select "Help" from the Firefox menu, then pick "About Firefox". Mac users need to select "About Firefox" from the Firefox menu. For non-English versions, Fully Localized Versions are available for download.
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