Firefox 99 for developers
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This article provides information about the changes in Firefox 99 that will affect developers. Firefox 99 is the current Beta version of Firefox and will ship on April 5, 2022.
Changes for web developers
Developer Tools
HTML
Removals
CSS
Removals
JavaScript
Removals
HTTP
Removals
Security
Removals
APIs
-
navigator.pdfViewerEnabled
is now enabled, and is the recommend 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
(bug 1720353). - The Network Information API was previously enabled on Android (only), but is now disabled by default on all platforms. The API is on the path for removal because it exposes a significant amount of user information that might be used for fingerprinting. (bug 1720353).
DOM
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 (bug 1253706).
Removals
WebAssembly
Removals
WebDriver conformance (Marionette)
Removals
Changes for add-on developers
Removals
Other
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