I'm not sure if this is what you are looking for, but I have been using headless Chrome through Selenium (using nightwatch.js) for some time now and it works gr

I'm not sure if this is what you are looking for, but I have been using headless Chrome through Selenium (using nightwatch.js) for some time now and it works great. You will probably need to rewrite your tests though, but they will support FF too. YMMV.