One problem we have had since we introduced video is that Firefox videos contained black borders. Not perfect (but it wasn’t affecting metrics). Setting the viewport larger than the default also made the video look broken. That is all fixed in 5.1, so we can have full quality videos from Firefox. “Skål och hurra!” as we say in Sweden.
In the new release we support testing sites behind Basic Auth as long as you use Chrome (Firefox support will come in Firefox 54 as long as Tobias fix in Selenium for running WebExtensions in Firefox gets released). Use --basicAuth username@password
.
Checkout the full Changelog for all changes. /Peter