I worked for Mozilla for 25 years and kept other browsers around the whole time. There's nothing wrong with having other browsers, and nothing technical that prevents it, so do that :D
I can't think of a time I didn't have more than one browser, even in 1995 when I made Netscape my default, I kept Cello around for some things. More browsers are better than fewer, not only for the industry, but for individuals too.
