I've been pretty happy with FF57. One thing I've noticed is that opening a new tab seems to block the browser. I have my new tab page set to a personal web page

I've been pretty happy with FF57. One thing I've noticed is that opening a new tab seems to block the browser. I have my new tab page set to a personal web page, which takes 150ms to fetch. If I open a new tab and press F6 before the page is loaded, it doesn't read the input. Other than that the only thing I really want is tab groups.