Firefox 99 for developers
This article provides information about the changes in Firefox 99 that will affect developers. Firefox 99 was released on April 5, 2022.
Changes for web developers
HTML
No notable changes.
CSS
No notable changes.
JavaScript
No notable changes.
APIs
-
navigator.pdfViewerEnabled
is now enabled, and is the recommended way to determine whether a browser supports inline display of PDF files when navigating to them. Sites that use the deprecated propertiesnavigator.plugins
andnavigator.mimeTypes
to infer PDF viewer support should now use the new property, even though these now return hard-coded mock values that match the signal provided bypdfViewerEnabled
(Firefox bug 1720353).
Media, WebRTC, and Web Audio
-
The
RTCPeerConnection.setConfiguration()
method is now supported. Among other things, this allows sites to adjust the configuration to changing network conditions (Firefox bug 1253706).
Removals
- The Network Information API was previously enabled on Android (only), but is now disabled by default on all platforms. This API is on the path for removal because it exposes a significant amount of user information that might be used for fingerprinting. (Firefox bug 1637922).
WebDriver conformance (Marionette)
- Fixed a bug where the Shift key was not handled properly when part of a key sequence of the
WebDriver:ElementSendKeys
command (Firefox bug 1757636).
Changes for add-on developers
Older versions
- 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
- Firefox 68 for developers