Your comments

Its not working. Followed the steps you described but when new tab is selected (+), mozilla's new tab appears for some seconds and then FVD speed dial, shows up again, with no dials on it this time. The only way to have mozilla's new tab, is to deactivate FVD   :(     which is not the goal here, but only not to take over new tab .
I really hope there is a solution to that, I love your extension and I remember its was an option to disable that in new tab as well to last tab. I understand its mozilla's new way to work, but isn't there any workaround?