For those curious about the direction of Mozilla Firefox web browser performance over the past year and a half, here are web browser benchmarks for every Firefox release from Firefox 120 in November 2023 through the newest Firefox 140 stable and Firefox 140 beta releases from a few days ago. Every major Firefox release was benchmarked on the same Ubuntu Linux system with AMD Ryzen 9 9950X for evaluating the performance and memory usage of this open-source web browser.
Following the recent Firefox 141 beta benchmarks looking at the lower RAM usage on Linux, I got carried away and decided to benchmark every Firefox release going back to Firefox 120 that debuted in November of 2023. Firefox 120 was the breaking point since Firefox 119 and prior ended up running into issues with Selenium / Gecko web driver for automating the benchmarks. So due to that breakage, Firefox 120 was the old cut-off but still a useful exercise in seeing the performance of Firefox on Linux over roughly the past nearly two years.
The release builds of every major Firefox release from Firefox 120 through Firefox 141 Beta were tested. In the case of Firefox 125, Firefox 125.0.1 was used since Firefox 125.0 binaries were removed due to problems. In addition to looking at the Firefox performance across a variety of web browser benchmarks, the RAM usage was also monitored for reference.
The same AMD Ryzen 9 9950X desktop system running Ubuntu 25.04 was used for collecting all of these fresh Mozilla Firefox web browser benchmarks. The testing is very straight-forward so let’s get right to it.
