Sounds like a lot but compare it to Edge also being patched for 428 Chromium CVEs this month. If 20 years ago you told me a single piece of software had 428 vulnerabilities I wouldn't have believed it. If Chromium has that many security bugs, perhaps the move fast and break things approach of spraying diarrhea masquerading as code into a keyboard — in a rush to add new features no one asked for — needs to be reexamin…
20 years ago software wasn't as much battle tested as today, had way less feature set, was less connected to the internet, and etc. 428 CVEs looks small, assuming not all have CVSS 9.8 or something.
That said, sure, it had a fraction of the features back then, and only a fraction of the world population was connected to the internet.