I tried the new Firefox and i have found one bug in the console.
Panel don’t show me parameters into console tab, but all works fine in network tab.
I hope it will be easy to fix.
I think you encounter https://bugzilla.mozilla.org/show_bug.cgi?id=1403927 , which is now fixed on Beta and DevEdition. Should be in release in 6/8 weeks.
I have updated my dev-ff and all works fine there.
I will wait for update base version.