Vet whether new Firefox Nightly profile-installation changes affect WebPageTest

Our/WebPageTest.org Firefox Nightly builds/runs might be broken on the 30th (i.e. 3 days), if the profile-installation changes announced in https://support.mozilla.org/en-US/kb/dedicated-profiles-firefox-installation?utm_source=desktop-snippet&utm_medium=snippet&utm_campaign=nightly_profile_management&utm_term=10533&utm_content=nightly affect wptagent's marionette_client uses.

Doesn't look like it, though we should look.

Just a heads-up @davehunt @pmeenan