This article provides information about the changes in Firefox 72 that will affect developers. Firefox 72 was released on January 7, 2020.
Changes for web developers
Developer tools
- Firefox-72.0.2-alt0.1.p9.i586.rpm: The Mozilla Firefox project is a redesign of Mozilla's browser: Classic x8664 Official: firefox-72.0.2-alt0.1.p9.x8664.rpm: The Mozilla Firefox project is a redesign of Mozilla's browser.
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- Follow these steps to switch from 32-bit to 64-bit Firefox: Go to this Mozilla Firefox download page and select the Windows 64-bit installer. Download the Firefox Setup file and save it to your computer. Do not run the installer yet. Click the Firefox menu and select Exit.
Chopper 2 1 2. Console:
- In the multi-line mode of the interactive JS interpreter, you can open and save files using the keyboard shortcuts Ctrl + O and Ctrl + S, respectively (bug 1592308).
- You can set a preference so that asynchronous messages are visually separated (bug 1592969).
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JavaScript debugger:
- You can now right/Ctrl click on objects in the Scopes panel, and choose Property set or Property get to set watchpoints (bug 1574192).
Network Monitor: Wattagio 1 2 2.
- The Timings tab now shows queued, started, and downloaded times for each resource (bug 1580431).
Page Inspector:
- You can set a preference to enable a simulator for different values of the
prefers-color-scheme
media feature (bug 1550804).
Removals
- The Scratchpad feature has been removed (bug 1519103).
HTML
No changes.
CSS
- CSS Shadow Parts are now enabled. This includes the
part
attribute and::part
pseudo-element, which allow shadow hosts to selectively expose chosen elements from their shadow tree to the outside page for styling purposes (bug 1559074). - CSS Motion Path has been shipped (bug 1582554, also see the Intent to Ship). This includes:
- The individual transform properties —
scale
,rotate
, andtranslate
— are now enabled by default (bug 1424900).
Removals
SVG
No changes
JavaScript
- The nullish coalescing operator has been implemented (bug 1566141).
APIs
New APIs
FormDataEvent
and event-based form participation is now enabled by default (bug 1594708).
![Bit Bit](https://pcwonderland.com/wp-content/uploads/2020/01/Mozilla-Firefox-72-Free-Download-111-3.jpg)
DOM
- The Geolocation API has had some interface name updates, as per recent spec changes (bug 1575144):
Coordinates
has been changed toGeolocationCoordinates
.Position
has been changed toGeolocationPosition
.PositionError
has been changed toGeolocationPositionError
.
- A number of properties have been updated to use standard stringifiers (bug 824857):
DOM events
Notification.requestPermission()
andPushManager.subscribe()
can now only be called in response to a user gesture such as aclick
event (bug 1593644).
Service workers
- The
WindowOrWorkerGlobalScope.crossOriginIsolated
property is now supported (bug 1591892).
Media, Web Audio, and WebRTC
- The
MediaDevices.getDisplayMedia()
method can now only be called in response to a user gesture such as aclick
event (bug 1580944). - The
RTCRtpContributingSource
dictionary can now include thertpTimestamp
property, which is a source-generated time at which the packet's media was generated or sampled (bug 1583867).
Removals
- Removed the non-standard
window.mozPaintCount
property. (bug 1591968) - The
BatteryManager
interface is no longer exposed to web content (bug 1441976). Navigator.vibrate()
is no longer supported in cross-origin<iframe>
s (bug 1591113).- WebRTC no longer supports the
rid=
andpt=
parameters on thesimulcast
attribute. The new syntax for a line such as 'a=simulcast: send rid=7 recv rid=8
' is now 'a=simulcast: send 7 recv 8
'. The new syntax has been supported since Firefox 68, so now it's time tor retire support for the old syntax (bug 1470568).
Security
- Opting-out of MIME sniffing using
X-Content-Type-Options
is now also applied to top-level documents if aContent-type
is provided. This can cause HTML web pages to be downloaded instead of being rendered when they are served with a MIME type other thantext/html
. Make sure to set both headers correctly. (bug 1591932). - Dropped the support for HTTP Public Key Pinning (HPKP) because of the low adoption rate and interoperability risk. The
Public-Key-Pins
andPublic-Key-Pins-Report-Only
headers are now silently ignored bug 1412438.
Plugins
No changes.
WebDriver conformance (Marionette)
- Removed
Anon
andAnonAttribute
strategies fromWebDriver:FindElement
andWebDriver:FindElements
commands (bug 1587627). Webdriver:TakeScreenshot
no longer fails if captured area exceeds upper maximum bound for the canvas width, height, or size (bug 1590064).
Changes for add-on developers
API changes
- The
browserSettings.ftpProtocolEnabled
property has been implemented (bug 1592687). - The
BrowserSetting.onChange
event has been implemented (bug 1410412). - The
captivePortal.canonicalURL
property has been implemented (bug 1592932). - The callback functions for the
browserAction.onClicked
andpageAction.onClicked
events now include aOnClickData
property containing an object whose properties describe the mouse button pressed along with any keyboard modifiers (bug 1405031). This allows support for additional types of mouse click.
Manifest changes
No changes.
See also
- Hacks release post: Firefox 72 — our first song of 2020