Firefox 115 [Instant - 2024]

Firefox 115 marked the definitive end of the road for several major operating systems. Mozilla announced that Firefox 115 ESR would be the for:

For modern users, the standard "Rapid Release" version of Firefox (now well past version 120) is recommended for the latest features. However, remains vital for: firefox 115

Users on these legacy operating systems were moved to the Firefox 115 ESR channel and will be upgraded to Firefox 128 or newer versions. They will remain on the 115 branch until Mozilla ceases security updates for that specific legacy branch (expected to be September 2024, though users are strongly encouraged to migrate before then). Firefox 115 marked the definitive end of the

Because Lina’s father had left her one more thing: a custom user.js file so dense with overrides, legacy TLS ciphers, and user-agent masquerades that it looked less like a configuration and more like a spellbook. They will remain on the 115 branch until

Lina had inherited it from her father, a sysadmin who had sworn by the fox. He’d installed it on a refurbished ThinkPad in 2024 and never updated it past 115. “Because,” he’d said, tapping the screen, “after this, they broke the old extension API. After this, they stopped caring about us .”

While much of the discourse surrounding v115 focuses on its legacy support, it introduced several functional upgrades for the general user base.