Mozilla Releases Firefox 54 Which Finally Uses Multiple Processes [Download]

Mozilla has announced the release of Firefox 54, a new version of the web browser which finally uses multiple processes.

The old Firefox used a single process to run all the tabs in a browser. Modern browsers split the load into several independent processes. We named our project to split Firefox into multiple processes ‘Electrolysis ’ (or E10s) after the chemical process that divides water into its core elements. E10s is the largest change to Firefox code in our history. And today we’re launching our next big phase of the E10s initiative.

Firefox 54 uses up to four processes by default, helping the browser run faster and crash less. Mozilla believes the use of four processes strikes the 'just right' balance between speed and memory usage. Advanced users may want to increase the number of content processes. This will use additional memory but make Firefox faster. You can adjust the number using the dom.ipc.processCount setting in about:config.


Mozilla says its testing has found that Firefox used significantly less RAM than other browsers on Windows 10, macOS, and Linux. See the chart below for more details.

Firefox 54 Changelog:
● New: Added Burmese (my) locale
● New: Added support for multiple content processes (e10s-multi)
● New: Simplified the download button and download status panel
● Fixed: Various security fixes
● Changed: Moved the mobile bookmarks folder to the main bookmarks menu for easier access
● Developer: Additional changes for web developers
● Developer: Added ability to create and save custom devices in Responsive Design Mode

Download for Mac, Windows, Linux