Good news! Firefox 56 is here. It was released today and has several brand new features such as built-in screenshots so you don't have to use an extension and features from Firefox Quantum that is the next major release.
You can already try it within your browser with Browserling:
What's new in Firefox 56?
- Launched Firefox Screenshots, a feature that lets users take, save, and share screenshots without leaving the browser.
- Added support for address form autofill (en-US only).
- Added search tool so users can find a specific setting quickly.
- Reorganized preferences so users can more easily scan settings.
- Rewrote descriptions so users can better understand choices and how they affect browsing.
- Revised data collection choices so they align with updated Privacy Notice and data collection strategy.
- Media opened in a background tab will not play until the tab is selected.
- Improved Send Tabs feature of Sync for iOS and Android, and Send Tabs can be discovered even by users without a Firefox Account.
- Replaced character encoding converters with a new Encoding Standard-compliant implementation written in Rust.
- Added hardware acceleration for AES-GCM.
- Updated the Safe Browsing protocol to version 4.
- Reduced update download file size by approximately 20 percent.
- Improved security for verifying update downloads.
Changes for Web developers in Firefox 56
- Display Negative Line Numbers in CSS Grid Inspector.
- The new CSS Grid Layout Panel is now available, allowing much better CSS Grid debugging facilities.
- Implemented the
labelsproperty for labelable form controls.
<isindex>element has been removed from the HTML parser, and from form submission.
<applet>element has been removed.
- Implemented the proprietary Mozilla-specific
- The Intl API has been enabled on Firefox for Android.
- On Mac,
Document.hiddenis now true when the window is behind another non-translucent application.
The Gamepad.displayIdproperty has been implemented.
PerformanceTiming.secureConnectionStartproperty has been implemented.
- Firefox used to accept
iso-2022-jp-2sequences silently when an
TextDecoder()was instantiated, however this has now been removed to simplify the API, as no other browsers support it and no pages seem to use it.
- The 4ms clamping behaviour of
setInterval()has been updated to be more in line with other browsers, as described in Timeouts throttled to >=4ms.
- The Page Visibility API's
Document.onvisibilitychangehandler has been added.
Window.showModalDialog()method has been removed.
- The implementation of the
HTMLButtonElement.formActionproperties has been updated so that they return the correct form submission URL, as per spec.
GlobalEventHandlers.onwheelis now available on
HTMLElement— it wasn't before.
- Firefox now supports the
RTCPeerConnectionproperties which let you examine the current and pending configurations of the local and remote ends of the connection, to help manage changes in configuration:
- Hardware encoding of media is now enabled by default on Android.
CanvasRenderingContext2D.drawImage()method has been updated s-o that smoothing occurs when downscaling even if
SVGImageElementcan now be used as a
CanvasImageSource, e.g. as the image source in a
- Firefox for Android has removed all support for plugins.
- Gecko now encodes URLs internally as punycode, to avoid URL encoding problems.
- Firefox on Windows and Mac OS X can now be made to run in headless mode using the
Changes for add-on and Mozilla developers
browsingData.RemovalOptionsgets "hostnames" option for cookies.
browsingData.removeCookies()are now supported on Firefox for Android.
browser_styleusage is changed.
cookies.remove()now work in private browsing mode.
downloads.open()can now only be called from a user action.
FindProxyForURL"DIRECT" return type no longer takes an argument.
history.onVisitednow includes the page title if it is known.
menusnow supports the "tools_menu" context.
menus.OnClickDatanow has "linkText".
menus.create()now has an "icons" option.
pageAction.hide()are now supported on Firefox for Android.
- permissions now supports "unlimitedStorage".
protocol_handlersnow supports "gopher".
proxy.registerProxyScript()is renamed to
runtime.onInstalledgets temporary flag.
windows.update()now support prefacing window title.
Bug fixes in Firefox 56
- CVE-2017-7793: Use-after-free with Fetch API.
- CVE-2017-7817: Firefox for Android address bar spoofing through fullscreen mode.
- CVE-2017-7818: Use-after-free during ARIA array manipulation.
- CVE-2017-7819: Use-after-free while resizing images in design mode.
- CVE-2017-7824: Buffer overflow when drawing and validating elements with ANGLE.
- CVE-2017-7805: Use-after-free in TLS 1.2 generating handshake hashes.
- CVE-2017-7812: Drag and drop of malicious page content to the tab bar can open locally stored files.
- CVE-2017-7814: Blob and data URLs bypass phishing and malware protection warnings.
- CVE-2017-7825: OS X fonts render some Tibetan and Arabic unicode characters as spaces.
- CVE-2017-7815: Spoofing attack with modal dialogs on non-e10s installations.
- CVE-2017-7816: WebExtensions can load about: URLs in extension UI.
- CVE-2017-7821: WebExtensions can download and open non-executable files without user interaction.
- CVE-2017-7823: CSP sandbox directive did not create a unique origin.
- CVE-2017-7822: WebCrypto allows AES-GCM with 0-length IV.
- CVE-2017-7820: Xray wrapper bypass with new tab and web console.
- CVE-2017-7811: Memory safety bugs fixed in Firefox 56.
- CVE-2017-7810: Memory safety bugs fixed in Firefox 56 and Firefox ESR 52.4.
Unresolved issues in Firefox 56
- Startup crash with RelevantKnowledge adware installed. Firefox Support has helpful instructions to remove it.
- Startup crashes with 64-bit Firefox on Windows 7, for users of Lenovo's "OneKey Theater" software for IdeaPad laptops. To fix this crash, please re-install 32-bit Firefox.
- Users running Firefox for Windows over a Remote Desktop Connection (RDP) may find that audio playback is disabled due to increased security restrictions. Learn how to mitigate this issue until it is corrected in an upcoming release.
- Due to a bug in Mac OS X High Sierra, fullscreen mode has some issues.
Have fun cross-browser testing your webapps in Firefox 56!
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