This release adds Intl.Locale info methods like getCalendars(), getWeekInfo(), and getTextInfo(), the Error.stackTraceLimit property, import source for loading unevaluated modules, getAllRecords() for IndexedDB object stores and indexes, desktop Picture-in-Picture API support, WebAssembly JS Promise Integration via WebAssembly.Suspending, and the experimental link-parameters CSS property for passing parameters to SVG.
developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/153