Mozilla Firefox is the only modern alternative to Google Chrome and third-party browsers based on the Chromium engine, but it's still lacking something in the performance department. Chrome was created to speed up web development, and it arguably provides the fastest experience overall. But Mozilla's software has recently made strides – in one specific benchmark, at least.
Mozilla regularly tests Firefox's performance against Chrome throughout the day, with developers also striving to enhance their code in various aspects. The same version of Firefox Nightly that showcased the browser's improved speed in the SunSpider benchmark introduced numerous changes that are expected to become more apparent in the coming months.
Changes include a new version of the Firefox View management tool, enhancements in upload speed over HTTP/2, extended support for credit card auto-fill in additional regions, and more.
Firefox Nightly stands among the three "experimental" versions of the FOSS browser provided by Mozilla. In comparison to the Beta and Developer Edition channels, Nightly releases are more prone to disruptions, displaying bugs and inconsistencies while Mozilla continues to work on the "next generation."