Firefox 38 Stable has just been released by Mozilla. The new version of the web browser is already available via the browser's automatic update feature but can also be downloaded from the official Mozilla website instead.
As is the case in every release cycle, Firefox Beta, Developer and Nightly versions were also updated to version 39, 40 and 41 respectively.
In addition, Firefox 38 is the new base for Firefox's Extended Support Release channel.
You can find out which version and channel of Firefox you are running by loading about:support in the web browser's address bar. There you find the version listed under application basics near the top of the page.
The following guide offers complete information about changes in Firefox 38.
The version of Firefox that you are running should have picked up the update already if automatic updates are enabled in it.
To run a manual check for updates in Firefox, tap on the Alt-key on your keyboard and select Help > About Firefox from the menu.
This opens the about page in the browser which highlights the current version and runs an update check to find out if updates are available.
If you prefer manual downloads of the new version, use the following links to download the latest version to your local system. You can run those on the system to install the update this way.
Preferences are now displayed in tabs
The options are no longer displayed in a window when opened in Firefox but displayed in a tab instead. There are multiple ways to open the options, for instance by loading about:preferences directly in the browser's address bar or through the Firefox menu.
The options have their own address now and one benefit of that is that you can jump directly to specific option pages you are interested in. Here they are:
You can restore the old way of displaying preferences in a window instead, at least for now.
If you set it to false, the options open in a window and if you set it to true, they open in a tab in the browser.
Autocomplete=off no longer support for user/password fields
Websites and services can use the HTML input attribute autocomplete to specify whether form fields support auto-completion.
If the feature is disabled, the browser won't display suggestions when you start to type which in turn meant that several password managers would not store login information for sites that use the attribute.
Starting with Firefox 38, the attribute is no longer supported by Firefox for username and password fields which should reduce issues that it caused in the past in this regard.
Encrypted Media Extensions (EME) API support added to Windows Vista and later versions of Windows
Note: A DRM-Free version of Firefox is available as well now. You can download it from the Mozilla FTP server.
This adds DRM playback capabilities to the Firefox web browser. In line with that is the automatic download of the Adobe Primetime Content Decryption Module (CDM) for DRM playback through EME on supported systems.
If you don't watch DRM content in Firefox, you may want to disable or even uninstall the Adobe Primetime CDM especially since it is automatically enabled by default.
If you disable Adobe's Primetime CDM, you can reactivate it easily again at any point in time using the same method:
To enable it again, switch it back to always activated.
Note: there is no option to set it to ask to activate (click to play).
Uninstall CDM completely and stop future CDM downloads
The second option that you have is to uninstall the CDM in Firefox. This makes sense if you dislike DRM or are sure that you will never use it.
As soon as you do that, Adobe's Primetime CDM is uninstalled which you can verify by opening the plugins manager in Firefox again.
Note: If you check the box again, Primetime will be downloaded and installed again.
Firefox for Android shares most changes with the desktop version of the browser. The following changes are Android-specific:
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