Firefox 145 release notes for developers

Adds support for the text-autospace CSS property, the math generic font family, and <hr> in <select> menus on Android. JavaScript gains Atomics.waitAsync() for non-blocking thread sync, and HTTP introduces Integrity-Policy headers for script integrity. Matroska container support, new WebDriver BiDi events, and experimental features like Anchor Positioning and Trusted Types.

developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/145