77 fixes: Firefox 158 adds JPEG XL and AI form filling
Mozilla released Firefox 158 for Windows, macOS, Linux and Android. It patches 77 security flaws, so updating is a good idea.
Firefox has a new version. It fixes many security problems, so please update it. It also adds help for filling out forms and a new picture type.
77security flaws fixed
Hype check
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Quieter than it deserves. This one matters more than the coverage suggests.
Our editorial opinion, based on the sources below. How we score
Why it matters
Browser updates close security holes. Updating takes a minute.
For most people
Try it: open Firefox's About page to update.
The details
- Firefox 158 fixes 77 flaws: 30 high, 33 medium and 14 low risk, per PCWorld.
- The new Smart Windows feature fills in forms with AI and is rolling out slowly.
- JPEG XL image support moves from a Labs test to the browser.
- Saved PDFs are now more accessible.
- Firefox 159 is planned for October 27, 2026.
Try itUpdate Firefox to get the security fixes.
Receipts
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