With WebAssembly, developers will be able to code a game or app and know it will run in the same way on any supported browser, regardless of platform. Consumers get the convenience of using a web browser to run any WebAssembly-enabled game or app, regardless of platform or operating system.
As WebAssembly matures, the Mozilla team hopes to bring it to mobile, as well. Imagine playing the modern version of Doom or running a CAD app on your Mac or PC, then loading it up onto your smartphone as you head out on your morning commute. All of this without plugins or the need to sacrifice speed for the convenience of the web.
The Firefox beta, available today for Mac, PC and Linux, also includes improvements to Wi-Fi portal detection and better warnings for insecure logins.