This would feel a lot more like a relevant nit to pick if there were actually meaningful differences where I might go get a TLS cert and find it's trusted in Chrome but not Firefox or vice versa.
Chrome vs Firefox doesn't matter that much, but more significantly windows trusts more CAs than Chrome and Firefox. Not sure about the exact amount, but it seems to be somewhat significant amount. You can take a look at https://www.ccadb.org/resources I looked at it but couldn't quickly get a number, so no number in my comment.
