I'm cursing for about a year about this. I spent days searching for workarounds and stopped short of hacking into firefox. Maybe I should just install firefox 50 and disable updates.
Only thing I've found is that hitting ALT-Home keys in the new tab will load the home page. But it's one of those tiny repeated annoyances that I'd love to avoid.
I can't really comment fairly here as I've gotten used to Chrome for the last 2+ years, but is there really not an extension in Firefox for this, even if it's not natively supported? Seems surprising to me.
Yes there are, but for some reason using a local file is a problem. Something about the ability of WebExtension to access a local file. Probably sensible, but in this case annoying.