I am longtime Firefox user and i diagree. Firefox will never be big or profitable and should double down on its fanbase. Being divergent from the norm is a feature not a bug. It is the reason people are still using it. Being non-profit and open source is the strength that will always keep it alive because its funders are its fans.

If a website stops working on Firefox I won't use the website. If i really have to use the website I will switch to Vivaldi temporarily. If i have to use it regularly I'll complain about it to the website support. Every time I use it.

It is worth being loyal to me for Firefox, because I am loyal to them. I won't switch to chromium based browsers out of principle.