I mean, maybe, in theory, someday. But the browser would still be "Firefox", that is, very few people would even be aware of this name, regardless of what the name is.
NSPR is still all over the tree. Off the top of my head there's some log functionality, the print format strings, and the environment variable support in use. Searchfox turns up a bunch more: https://searchfox.org/mozilla-central/search?q=PR_&case=true...
I think you must’ve taken my comment too seriously... I agree that Firefoxs success does not depend on the meaning behind the name holyjit lol. It was just a joke.
The main point was that if they came up with this name without the intention of punning holy shit, I have low confidence in their abilities to succeed in general and with Firefox in particular. But also don’t take this too seriously.