He says “many Firefox users will see as godsend” and I may be one of them.
My browser is heavily customised from years of tweaking it.

“… Australis will remove a lot of features, and it was not really clear if add-on developers would create extensions in time to provide users with restore options.
“Mozilla developer Aris, who is responsible for the Classic Toolbar Buttons add-on revealed that he has created an add-on that many Firefox users will see as godsend. …”

Source: Ghacks Technology Newsletter
More  Good News: Firefox Add-on to restore classic functionality when Australis launches