Audio & Video

Canvas & WebGL

CSS

• -moz-appearance property has been removed
• Prefixed CSS3 multi-column properties will be removed
• Prefixed CSS Animations, Transforms, Transitions support will be removed
• Prefixed cursor types will be removed
• -moz-border-image will be removed
• -moz-outline-radius will be removed
• Affecting Non-standard CSS display types will be removed
• -moz-prefixed gradient support to be removed, make sure you have unprefixed gradients

DOM

• window.content will be removed
• Element.mozMatchesSelector will be removed
• MouseEvent.mozPressure will be removed
• window.sidebar will be removed
• navigator.buildID will be removed

HTML

• HTML context menu support will be removed
• Application Cache support will be removed
• hspace/vspace attributes on <table> will no longer be supported

JavaScript

• Non-standard Array/String generics will be removed

Miscellaneous

Networking

• Affecting Insecure HTTP will be deprecated
• Affecting Third-party cookies may be disabled by default in the future
• Affecting RFC 2047 support for Content-Disposition header will be removed

Plug-ins

Privacy & Security

• Affecting Insecure HTTP will be deprecated
• Affecting Third-party cookies may be disabled by default in the future
• navigator.buildID will be removed

SVG

• Several properties will be removed from SVGSVGElement