Mozilla Firefox 158
Package
Firefox 158 adds JPEG XL image support, produces more accessible PDFs when printing on Linux and macOS, keeps a library of New Tab wallpapers, and fixes favicon contrast on Ubuntu.
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Firefox 158 was released on October 13, 2026. We covered it in the news. The previous release is Firefox 157.
What changed
- JPEG XL images now display
- Save as PDF and printing on Linux produce more accessible PDFs, fixing problems such as missing math symbols
- New Tab keeps a library of custom wallpapers
- Smart Window form suggestions roll out gradually
- Smoother scrolling: positions are no longer rounded to whole pixels
- Linux fixes for favicon contrast on Ubuntu’s default theme and underlined letters in the search menu
- Security fixes
Installing
Distribution packages and Flathub update within days. The tarball runs from any directory and updates itself when that directory is writable by your user:
tar xf firefox-158.0.tar.xz -C ~/.local/opt/
~/.local/opt/firefox/firefoxVerify Your Download
Mozilla publishes signed SHA256SUMS and SHA256SUMS.asc files in each release directory.