See what landed recently in Firefox Nightly!

Starting with Firefox 156, in Nightly builds the centering of content inside buttons and text inputs is now expressed with align-content in the built-in stylesheet, so pages can override it.

Starting with Firefox 156, Firefox Nightly supports Scoped Custom Element Registries. Those registries can be created using the CustomElementRegistry() constructor that are separate from the global window.customElements registry. Creating more than one registry is useful for multiple custom elements that have the same tag name to coexist.

Starting with Firefox 158, the Sanitizer API in Firefox Nightly builds sanitizes while parsing rather than the reified tree, extending sanitizing to scoped registries and declarative shadow roots.

Starting with Firefox 158, Firefox Nightly supports the corner-shape property, including all corner-*-shape longhand properties, allowing to change the shape of the corners of an element.

Starting with Firefox 158, Firefox Nightly now supports the random() CSS function, which allows authors to introduce randomness into their styles, generating a random value in a given range (with an optional increment) that is usable anywhere that math functions can be specified.

Starting with Firefox 158, Firefox Nightly now supports streaming uploads with the Fetch API, allowing web applications to send request bodies incrementally using a ReadableStream without buffering the entire body first.