Firefox 118 for developers

• The <search> element is now supported. The <search> element is a group element that serves to contain all the elements used in a search or filtering operation (Firefox bug 1824121).

• The mathml.legacy_maction_and_semantics_implementations.disabled preference is now removed, which means that the <semantics> and <maction> elements only render the first child element by default (Firefox bug 1788223).

Removals

• Multiple CSS math functions are now supported: abs(), sign(), round(), mod(), rem(), pow(), sqrt(), hypot(), log(), and exp() (Firefox bug 1814589).
• A new keyword from-font in the CSS property font-size-adjust enables picking the desired <font-metric> from the first available font (Firefox bug 1708240).

Removals

Removals

Removals

• The HTTP Permissions-Policy header's publickey-credentials-get directive is now supported, which can be used to enable the Web Authentication API interface for retrieving public-key credentials in a cross-origin iframe (Firefox bug 1460986).

Removals

Removals

• The ⊞ Windows Logo key on Windows and the Command key on macOS now return a value of "Meta" for KeyboardEvent.key, instead of "OS", and KeyboardEvent.code returns MetaLeft/MetaRight instead of OSLeft/OSRight (Firefox bug 1232918).
• The RTCRtpTransceiver.currentDirection and RTCRtpTransceiver.direction properties now support the "stopped" value for indicating whether a transceiver has stopped, and should be used instead of the deprecated RTCRtpTransceiver.stopped property (Firefox bug 1568296).
• The array returned by RTCPeerConnection.getTransceivers() now omits stopped transcievers. Similarly, RTCPeerConnection.getReceivers() and RTCPeerConnection.getSenders() omit the receivers and senders associated with a stopped transceiver (Firefox bug 1568296).
• The TextMetrics.emHeightDescent and TextMetrics.emHeightAscent properties are now supported (Firefox bug 1841692).
• CSSStyleRule now inherits from CSSGroupingRule instead of directly from CSSRule, with the result that it additionally implements the property cssRules and the methods deleteRule() and insertRule() (Firefox bug 1846251).

DOM

Media, WebRTC, and Web Audio

Removals

Removals

WebDriver BiDi

Marionette

• Support for browser_style in the manifest keys action, options_ui, page_action, and sidebar_action for Manifest V3 extensions has been removed (Firefox bug 1830711). See Browser Styles' Manifest v3 migration for information about transitioning from browser_style in Manifest V3 extensions.