'Mozilla has announced through its Mozilla Hacks blog that it plans to ship a 'novel sandboxing technology' called RLBox with Firefox 95 which it has been developing alongside researchers from the University of California San Diego and the University of Texas. From a report:

It said RLBox makes it easier to isolate subcomponents of the browser efficiently and gives Mozilla more options than traditional sandboxing granted it. Mozilla said this new method of sandboxing, which uses WebAssembly to isolate potentially-buggy code, builds on a prototype that was shipped in Firefox 74 and Firefox 75 to Linux and Mac users respectively. With Firefox 95, RLBox will be deployed on all supported Firefox platforms including desktop and mobile to isolate three different modules: Graphite, Hunspell, and Ogg. With Firefox 96, two more modules, Expat and Woff2, will also be isolated.'

-- source: https://news.slashdot.org/story/21/12/06/1558251

Cheers, Peter