Why do you use multiple browsers?
It seems normal, but I'm not sure motives. For me it is a lot to do with an obtuse sense of security. E.g., if sites can id your browser, maybe if you use a different one they'll think you're a different user.
I also fear sites' access to my config data. As a result I use one browser for shopping, another for politics, another for tech, etc., and each of these tend to have an associated webmail account (likely on the same service).
Is using multiple browsers this way a waste of energy?