📃 June 2020 release notes

New in Firefox

The following features are now available in Firefox:

• Intl.ListFormat: The Intl.ListFormat API creates a locale-aware formatter that turns iterable objects into localized strings.
• Preloading responsive images: The imagesrcset and imagesizes attributes with the rel="preload" attribute for the <link> HTML element starts fetching responsive images before they're found in the body of the document.
• :read-only and :read-write: The :read-only and :read-write CSS pseudo-classes match elements that are read-only or read-write, respectively. For example, :read-only matches <input> and <textarea> elements with the readonly attribute.
• String replaceAll(): The replaceAll() method of strings returns a new string where all matches of a pattern (a string or regular expression) have been substituted with a replacement string.
• BigInt to i64 conversion (WebAssembly): Integer values pass bidirectionally between JavaScript and WebAssembly, converted to i64 values in WebAssembly or BigInt values in JavaScript.
• Bulk memory operations (WebAssembly): Bulk memory operations, such as copy and init, mirror the efficiency of native memcpy and memmove operations.
• Multi-value (WebAssembly): Instructions and blocks can produce multiple result values.