01-05-2021



Mozilla Firefox 43.0

To test the latest developer features of Firefox,
install Firefox Developer Edition Firefox 43 was released on December 15, 2015. This article lists key changes that are useful not only for web developers, but also Firefox and Gecko developers as well as add-on developers.

Firefox was created by Mozilla as a faster, more private alternative to browsers like Internet Explorer, and now Chrome. Today, our mission-driven company and volunteer community continue to put your privacy above all else. Your privacy comes first. Free mozilla firefox 43.0.1 download download software at UpdateStar - Coupon Search Plugin for Firefox, find some of the best discounts and deals around from the best retailers on the net. Coupons, discount codes and more. CouponMeUp have thousands of the best coupons from hundreds of online retailers. Screenshot for Mozilla Firefox 43.0.4 Final ยซ ListParts Mozilla Firefox 43.0.4 Final Quicktime 7.7.9 ยป Comment Rules & Etiquette - We welcome all comments from our readers, but any comment section requires some moderation. Free mozilla 43.0.1 download software at UpdateStar - Coupon Search Plugin for Firefox, find some of the best discounts and deals around from the best retailers on the net. Coupons, discount codes and more. CouponMeUp have thousands of the best coupons from hundreds of online retailers.

Changes for Web developers

Developer Tools

Highlights:

All devtools bugs fixed between Firefox 42 and Firefox 43.

CSS

  • Support for the standard, unprefixed version of hyphens has been landed (bug 953408).
  • The shorthand property font has been updated to accept font-stretch values (bug 1057680).
  • To match a latest evolution of the specification, the :fullscreen pseudo-class now selects the whole stack of elements in full screen, and not only the top-level one (bug 1199522).
  • The deprecated SVG values for the writing-mode, lr, lr-tb, rl, tb, and tb-rl, have been added in CSS as aliases to standard properties (bug 1205787).

HTML

  • For <img> with ICO image containing multiple frames, the intrinsic dimension of the image is set to the one of the largest frame, and no more of the smallest frame bug 1201796.
  • The value of the document's viewport (defined with <meta name='viewport>)can now dynamically be changed via JavaScript (bug 976616).

JavaScript

New APIs

  • The new ES2016 methods Array.prototype.includes() and TypedArray.prototype.includes() are now enabled by default (bug 1070767).

Changes regarding the arguments object

  • To match the ES2015 specification, arrow functions no longer have their own arguments object. The arguments object is now lexically bound (inherited from the outer function). In most cases, rest parameters are a good alternative (...args) => args[i], see bug 889158.
  • The arguments object is now allowed in conjunction with rest parameters (bug 1133298).
  • From now on, a mapped arguments object in non-strict functions is only provided if the function does not contain any rest parameters, any default parameters or any destructured parameters (bug 1175394).
Mozilla Firefox 43.0

Other changes

  • Generators and generator methods are no longer constructable as per ES2016 (bug 1191486).

Interfaces/APIs/DOM

DOM & HTML DOM

No change.

IndexedDB

  • A new feature called locale-aware sorting has been added allowing for the creation of indexes with a locale specified, which can then be used to sort data according to the rules of that locale (bug 871846). This is a non-standard Firefox-specific feature.

Service Workers

  • As per the specification, if ExtendableEvent.waitUntil() is called outside of the ExtendableEvent handler, Firefox will now throw an InvalidStateError; in addition, multiple calls to waitUntil() will now stack up, and the resulting promises will be added to the list of extend lifetime promises (bug 1180274).
  • PushMessageData methods have been implemented (bug 1149195).

WebRTC

  • The HTMLCanvasElement.captureStream() method has been activated by default (bug 1177276).
  • The non-standard constraint style option list for RTCOfferOptions has been deprecated and will be removed entirely in Firefox 44; see this post on the site compatibility blog for details.

Miscellaneous

  • The Battery Status API now uses the new promise syntax for Navigator.getBattery(), as specified in the recent evolution of the specification (bug 1050749).
  • The User-Agent header is no longer in the list of forbidden header names so it can now be set in a FetchHeaders object, via XHR XMLHttpRequest.setRequestHeader(),โ€ฆ (bug 1188932).
  • The MediaRecorder.MediaRecorder() constructor can now accept an options dictionary as a parameter, which allows you to set custom bitrates for the audio/video to be recorded (bug 1161276).
  • The PerformanceObserver interface, belonging to the Performance Timeline API has been implemented (bug 1165796).
  • The Frame Timing API has been added: the PerformanceRenderTiming and PerformanceCompositeTiming interfaces are now available (bug 1191178).
  • The modern Screen Orientation API has been implemented: unprefixed Screen.orientation and the ScreenOrientation interface are now available (bug 1131470). The non-standard Screen.mozOrientation, Screen.onmozorientationchange, Screen.mozLockOrientation(), and Screen.mozUnlockOrientation() will be removed in the future.
  • Under Linux, like under Windows, Event.timeStamp now returns a DOMHighResTimeStamp (bug 1026803).
  • Experimental support for Selection events selectionchange and selectstart, as well as the Document.onselectionchange and GlobalEventHandlers.onselectstart event handlers property has been added (bug 571294). The selectionchange event is fired on the Document if the associated Selection object is concerned, or on the specific HTMLInputElement or HTMLTextAreaElement (bug 1196479). This feature is controlled by the dom.select_events.enabled preference, that defaults to false, except on Nightly.
  • Support for MouseEvent.offsetX and MouseEvent.offsetY have been activated on Firefox for Android and Firefox OS (bug 1204841).
  • The HTMLCanvasElement.mozFetchAsStream() method has been removed (bug 1206030).
  • The constructor Request() as well as fetch() will now raise a TypeError exception when used with a URL containing a username and password (bug 1195820).

MathML

SVG

No change.

Audio/Video

Mozilla Firefox 43.0

HTTP

Mozilla

No change.

Networking

Security

  • Access to Web Storage (i.e. localStorage and sessionStorage) from third-party IFrames is now denied if the user has disabled third-party cookies (bug 536509).
  • This whitelist has even been removed in Nightly and Aurora/Dev Edition of the browser (bug 1201023). It is currently scheduled that this removal will also happen for Beta and Release versions for the next version (Firefox 44).
  • Subresource integrity has been implemented for <script> and <link> that links to stylesheets (bug 992096).

Changes for add-on and Mozilla developers

Interfaces

No change

XUL

JavaScript code modules

No change.

XPCOM

Plugins

  • In preparation for future releases to switch over to multi-process content, NPAPI plugins can no longer be run in the same process as the page content. The preferences starting with dom.ipc.plugins are no longer used.

Other

See also

43.0

Older versions

Related Topics:

'Intel(R) Management Engine Components' Installed Program on Windows 8
What is the installed program 'Intel(R) Management Engine Components' on my Windows 8 computer? 'Intel(R) Management Engine Components' is an installed program on Windows 8 system managed by the program itself. You will see 'Intel(R) Management Engine Components' listed on 'uninstall or change a pro... 2020-05-15, 2702๐Ÿ‘, 0๐Ÿ’ฌ

'Mozilla Firefox 43.0.1 (x86 en-US)' Installed Program on Windows 8
What is the installed program 'Mozilla Firefox 43.0.1 (x86 en-US)' on my Windows 8 computer? 'Mozilla Firefox 43.0.1 (x86 en-US)' is an installed program on Windows 8 system managed by the program itself. You will see 'Mozilla Firefox 43.0.1 (x86 en-US)' listed on 'uninstall or change a program' in ... 2020-05-05, 1710๐Ÿ‘, 0๐Ÿ’ฌ

'Intel(R) Processor Graphics' Installed Program on Windows 8
What is the installed program 'Intel(R) Processor Graphics' on my Windows 8 computer? 'Intel(R) Processor Graphics' is an installed program on Windows 8 system managed by the program itself. You will see 'Intel(R) Processor Graphics' listed on 'uninstall or change a program' in Control Panel with th... 2020-05-15, 1545๐Ÿ‘, 0๐Ÿ’ฌ

'Intel(R) Rapid Storage Technology' Installed Program on Windows 8
What is the installed program 'Intel(R) Rapid Storage Technology' on my Windows 8 computer? 'Intel(R) Rapid Storage Technology' is an installed program on Windows 8 system managed by the program itself. You will see 'Intel(R) Rapid Storage Technology' listed on 'uninstall or change a program' in Con... 2020-05-05, 1413๐Ÿ‘, 0๐Ÿ’ฌ

Mozilla Firefox Version 43 Download

'Realtek USB 2.0 Card Reader' Installed Program on Windows 8
What is the installed program 'Realtek USB 2.0 Card Reader' on my Windows 8 computer? 'Realtek USB 2.0 Card Reader' is an installed program on Windows 8 system managed by the program itself. You will see 'Realtek USB 2.0 Card Reader' listed on 'uninstall or change a program' in Control Panel with th... 2020-04-30, 1367๐Ÿ‘, 0๐Ÿ’ฌ

'Skype Click to Call' Installed Program on Windows 8
What is the installed program 'Skype Click to Call' on my Windows 8 computer? 'Skype Click to Call' is an installed program on Windows 8 system managed by the program itself. You will see 'Skype Click to Call' listed on 'uninstall or change a program' in Control Panel with the following information:... 2018-10-14, 1326๐Ÿ‘, 2๐Ÿ’ฌ

'Notepad++ (64-bit x64)' Installed Program on Windows 8
What is the installed program 'Notepad++ (64-bit x64)' on my Windows 8 computer? 'Notepad++ (64-bit x64)' is an installed program on Windows 8 system managed by the program itself. You will see 'Notepad++ (64-bit x64)' listed on 'uninstall or change a program' in Control Panel with the following inf... 2020-04-30, 1281๐Ÿ‘, 0๐Ÿ’ฌ

'Skype Web Plugin' Installed Program on Windows 8
What is the installed program 'Skype Web Plugin' on my Windows 8 computer? 'Skype Web Plugin' is an installed program on Windows 8 system managed by the program itself. You will see 'Skype Web Plugin' listed on 'uninstall or change a program' in Control Panel with the following information: Name: Sk... 2020-04-30, 1258๐Ÿ‘, 0๐Ÿ’ฌ

Firefox 43.0 Download

'Mozilla Maintenance Service' Installed Program on Windows 8
What is the installed program 'Mozilla Maintenance Service' on my Windows 8 computer? 'Mozilla Maintenance Service' is an installed program on Windows 8 system managed by the program itself. You will see 'Mozilla Maintenance Service' listed on 'uninstall or change a program' in Control Panel with th... 2020-05-05, 1187๐Ÿ‘, 0๐Ÿ’ฌ

Mozilla Firefox 43.0.2

'McAfee Security Scan Plus' Installed Program on Windows 8
What is the installed program 'McAfee Security Scan Plus' on my Windows 8 computer? 'McAfee Security Scan Plus' is an installed program on Windows 8 system managed by the program itself. You will see 'McAfee Security Scan Plus' listed on 'uninstall or change a program' in Control Panel with the foll... 2020-05-05, 1126๐Ÿ‘, 0๐Ÿ’ฌ