Of course, with any beta it's released on the basis of as is.


New features include:-

Add a search field to new tab page

Removal of the CAPS infrastructure for specifying site-specific permissions

WebVTT implemented and enabled

CSS3 variables implemented

Developer tools:-

navigator.sendBeacon enabled by default

New Array built-in: Array.prototype.fill()

New Object built-in: Object.setPrototypeOf()

and lots more

[mozilla.org...]