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---
title: Firefox 99 for developers
slug: Mozilla/Firefox/Releases/99
page-type: firefox-release-notes
---
{{FirefoxSidebar}}
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
- {{domxref("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 properties {{domxref("navigator.plugins")}} and {{domxref("navigator.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 by `pdfViewerEnabled` ([Firefox bug 1720353](https://bugzil.la/1720353)).
#### Media, WebRTC, and Web Audio
- The [`RTCPeerConnection.setConfiguration()`](/en-US/docs/Web/API/RTCPeerConnection/setConfiguration) method is now supported.
Among other things, this allows sites to adjust the configuration to changing network conditions ([Firefox bug 1253706](https://bugzil.la/1253706)).
#### Removals
- The [Network Information API](/en-US/docs/Web/API/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](https://bugzil.la/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](https://bugzil.la/1757636)).
## Changes for add-on developers
## Older versions
{{Firefox_for_developers}}