For developers interested in helping out, MDN has a [https://developer.mozilla.org/en-US/Add-ons/Working_with_multiprocess_Firefox good introduction to e10s], useful for both Firefox and add-on developers.
== What to Expect ==
Generally the browser should be stable and usable, without major issues or crashes. Profiles that have lots of older addons will likely experience slowness or other issues. If you run into any trouble, start diagnosing by disabling addons and testing again.
== Accessibility Support ===