Before being named Firefox, it was called variously Phoenix (having risen from the ashes of Netscape Navigator) and also the same name as one of Stravinsky’s most famous works.
Cf. “https://en.wikipedia.org/wiki/Firefox#Branding_and_visual_identity“.
Yes, familiar with Firebird, which began life as a ballet and rocketed Igor to fame with the Parisian crowd, who later rioted after his Rite of Spring 😆. Glory is fleeting.