Firefox 54 for the desktop is available for download now on Firefox.com, and all existing users should be able to upgrade to it automatically. As always, the Android version is trickling out slowly on Google Play.
Mozilla doesn’t break out the exact numbers for Firefox, though the company does say “half a billion people around the world” use the browser. In other words, it’s a major platform that web developers target — even in a world increasingly dominated by mobile apps.
Mozilla’s multi-process support in Firefox has been in development for years as part of the Electrolysis project. In fact, work to make the frontend and add-ons support multiple processes began in early 2013, and Firefox Nightly gained multi-process support in November 2014.
With the release of Firefox 48, Mozilla enabled multi-process support for 1 percent of users, slowly ramping up to nearly half of the Firefox Release channel. With Firefox 49, Mozilla expanded support to include a small initial set of compatible add-ons, declaring that the goal was to have all Firefox users with multi-process sometime in the first half of 2017.
