Call for testing - Firefox 57

Hi folks,

let's have some fun with upcoming Firefox 57 a.k.a Firefox Quantum. This
is a major Firefox update with key - pleasant and unpleasant - changes:

- fastest than ever with Rust, CSS Stylo, Sandbox...
- new "Photon" look
- and disabled XUL extensions

according to the disruptive nature of the update which is planned to
land in *all* Fedoras at Nov 14 I decided to put the update to the
testing as soon as possible, which mean we have Firefox 57 Beta packages
at update-testing right now.

If you don't consume update-testing regularly you can install Firefox
only by:

# dnf update --enablerepo=updates-testing firefox

and also expect new versions there. Please give it a shot and report any
issue to our [1] or Mozilla bugzilla [2].


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