See what’s new in Firefox!
Release Notes tell you what’s new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release.
54.0
Firefox Release
June 13, 2017
Version 54.0, first offered to Release channel users on June 13, 2017
Today's release is the first to run Firefox using multiple operating system processes for web page content, making Firefox faster and more stable than ever. Learn more about how multiple processes strike a “just right” balance between performance and memory use on the Mozilla Blog. Dive into the details (including performance benchmarks) on Medium.
We'd also like to extend a special thank you to all of the new Mozillians who contributed to this release of Firefox!
New
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Added Burmese (my) locale
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Added support for multiple content processes (e10s-multi)
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Simplified the download button and download status panel
Fixed
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Various security fixes
Changed
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Moved the mobile bookmarks folder to the main bookmarks menu for easier access
Developer
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Additional changes for web developers
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Added ability to create and save custom devices in Responsive Design Mode