Just on Firefox, dedepends on how old we are talking. Gen z? Probably not as they've mostly know Chrome as having been the best web browser. Old Millenials and young gen x know it as the next IE alternative after Netscape died. Old Gen X maybe depending on how old. Gen alpha and boomers, no way.
If knowledge of both is required, then even less so. Anytime I bring up Linux I get the feeling that it is like bringing up religion with a stranger.