Firefox 100 for developers
This article provides information about the changes in Firefox 100 that will affect developers. Firefox 100 was released on May 3, 2022.
Changes for web developers
HTML
No notable changes.
CSS
- CSS media features for
dynamic-range
andvideo-dynamic-range
are now supported. You can now test whether a user agent or an output device supports the combination of brightness, contrast ratio, and color depth by usingdynamic-range
and in the video plane by usingvideo-dynamic-range
(Firefox bug 1751217).
JavaScript
No notable changes.
HTTP
Removals
- The non-standard
Large-Allocation
HTTP header has been removed (Firefox bug 1598759).
APIs
WritableStream
,WritableStreamDefaultWriter
,WritableStreamDefaultController
, andReadableStream.pipeTo()
are now supported (Firefox bug 1759597).
DOM
-
Code can now use the static method
AbortSignal.timeout()
. This returns anAbortSignal
that can be used to automatically abort an operation withTimeoutError
after a specified time (Firefox bug 1753309).
WebAssembly
- WebAssembly now supports exceptions that can be thrown and caught in either WebAssembly or JavaScript (or some other runtime), crossing between the environment boundaries if not handled. The JavaScript representations of WebAssembly exceptions are WebAssembly.Exception and WebAssembly.Tag (Firefox bug 1759217).
WebDriver conformance (Marionette)
- Added support for user prompts (e.g.
alert
) on Android (Firefox bug 1708105).
Changes for add-on developers
- The
color_scheme
andcontent_color_scheme
properties are added to theme manifest key and available in thetheme
API. These properties enable a theme to override whether a light or dark color scheme is automatically applied to the chrome or content (Firefox bug 1708105). - You can now create a muted tab using
tabs.create()
with the newmuted
property in thecreateProperties
object (Firefox bug 1372100). - Support added for
runtime.onSuspend
andruntime.onSuspendCanceled
improving support for event page features (Firefox bug 1753850).
Older versions
- Firefox 99 for developers
- Firefox 98 for developers
- Firefox 97 for developers
- Firefox 96 for developers
- Firefox 95 for developers
- Firefox 94 for developers
- Firefox 93 for developers
- Firefox 92 for developers
- Firefox 91 for developers
- Firefox 90 for developers
- Firefox 89 for developers
- Firefox 88 for developers
- Firefox 87 for developers
- Firefox 86 for developers
- Firefox 85 for developers
- Firefox 84 for developers
- Firefox 83 for developers
- Firefox 82 for developers
- Firefox 81 for developers
- Firefox 80 for developers
- Firefox 79 for developers
- Firefox 78 for developers
- Firefox 77 for developers
- Firefox 76 for developers
- Firefox 75 for developers
- Firefox 74 for developers
- Firefox 73 for developers
- Firefox 72 for developers
- Firefox 71 for developers
- Firefox 70 for developers
- Firefox 69 for developers