As long as people work on forks, they survive. I think the more interesting question is about standardization and feature support in general: if FF and its forks are no longer a real force in the browser world, how will this shape what websites support and code for (i.e. making things slowly lose compatibility with firefox and its forks without major development).
I used chantix back in the day, but it also required me basically not leaving the house for a month to really get there. When and where I quit for the first time (I would later start dating a smoker and relapse, then quit again), smoking was still allowed indoors and I had a huge association with drinking and smoking. Same for certain other places and situations. I basically had to do everything I could to avoid those. It got easier with time.