Mozilla Firefox 51.0 Stable was released on January 24, 2017 to the public by Mozilla via automatic updates and on Mozilla's website.
Note: If you are reading this article on January 24, 2017, you may not be able to upgrade Firefox to version 51 yet as Mozilla may not have enabled the new version through automatic updates. Releases are always available on Mozilla's FTP before they are made available via Firefox's built-in update mechanism.
Mozilla Firefox 51 is the latest stable version of the browser. The new version replaces previous stable versions, including Firefox 50.1, the last version Mozilla released prior to the Firefox 51 release.
All Firefox channels follow the same release schedule. This means that Firefox Beta, Aurora, Nightly and Firefox ESR are updated as well. Mozilla released Firefox Beta 52, Firefox Aurora 53, Firefox Nightly 54, and Firefox ESR 45.7 today as well.
You may download the latest version of Firefox directly from the Mozilla website, or use the browser's automatic update capabilities to upgrade to the latest version.
To check for updates in Firefox, do the following:
Firefox will display the current version, and run a check for updates. Depending on how Firefox is configured, any updates found may be downloaded and installed automatically, or on user command.
You may download all editions of Firefox using the links below instead.
FLAC (Free Lossless Audio Codec) support
Mozilla Firefox 51 supports FLAC audio playback natively (in both FLAC and OGG containers). FLAC is also supported in MP4 with and without Media Source Extensions.
This means among other things that you can play any FLAC file directly in Firefox without issues, and that streaming services may stream FLAC audio streams to Firefox.
See bug 1195723 FLAC support / Create FLAC MediaDataDemuxer for additional information.
Google added FLAC support in Chrome 56 as well.
Firefox 51 highlights insecure login pages
Mozilla Firefox 51 displays an insecure notification in the browser's address bar when you visit a login page in the browser that is not using https.
The notification shows the red "connection is not secure" strike-through icon when that happens. Firefox did not display any notification previously when sites used http for login pages.
Google Chrome will do the same starting with Chrome 56.
Privacy improvement: BatteryManager.chargingTime and BatteryManager.dischargingTime precision limited to avoid fingerprinting.
This means that services cannot use the data that these two functions provide anymore for fingerprinting, as it returns a rounded value to the closest 15 minutes now.
Firefox's built-in password manager received two improvements in this release. The first adds a new "show password" option to the save dialog. This provides you with an option to reveal the password that Firefox is about to save in its database.
The second allows you to save passwords for forms without "submit" events.
Coming soon. Release notes list no major changes. At least some of the changes of the desktop versions of Firefox are also part of the Android version of the browser.
Security information is released by Mozilla after the official release of Firefox. We will update the information once Mozilla makes it available.
Firefox 51.0.1 was released on January 26, 2017. It is a bug fix release that fixes Geolocation not working on Windows, and another issue with add-ons that stated that they are not compatible with Firefox's new multi-process architecture but still marked as compatible by Mozilla.
Not released for Android devices.
Mozilla released an update for Firefox for Android that brings the version to 51.0.2. Please note that this update was not released for the desktop versions of Firefox. The patch fixes a crash issue on x86 Android devices.
Firefox 51.0.3 is only available for Android. Mozilla released the update on February 9, 2017. It includes security fixes, and fixes a build issue that caused crashes on some x86 architectures.
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