Marionette changes in Firefox 84

[Henrik Skupin]

Hi,

Firefox 84 has been released this week, and a couple of improvements and
bug fixes happened to the WebDriver conformance (means the Marionette)
component.

You can find all the details in the change log for web developers:

https://wiki.developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/84#WebDriver_conformance_Marionette

Please note that currently a major rewrite of the Marionette code to
support our site-isolation feature (Fission) takes place. With Firefox
84 this code has been enabled by default now. As such if you notice any
kind of regression please let us know and file a bug on Bugzilla. The
following link can be used:

https://bugzilla.mozilla.org/enter_bug.cgi?product=Testing&component=Marionette

Thanks a lot.

Best,

--
Henrik Skupin
Senior Software Engineer
Mozilla Corporation