Ditto here. I use Firefox exclusively and all of my extensions are supported - OneTab, ublock origin, Lastpass. I fail to understand the narrative of "the only thing keeping FF alive is the handful of extensions that can't be ported to Chrome". I don't think the extension API is where this battle will be fought anyway. Performance and reliability are what users care about - is the browser fast to open, are pages fast to load, is it making other apps slow (memory and CPU consumption), how many tabs can I keep open, does it hang, does it crash, does any website fail to load/misbehave?
I'm confident Firefox will outstrip Chrome in these areas in the next year or so. But if it doesn't... it will die a slow death and the people on HN will assure us it was because NoScript didn't work anymore.
The only addon I use is LastPass. They support the new extension format just fine. I'm looking forward to the architectural changes coming in Servo, etc, which WebExtensions help make possible. I can't be the only user like me.