Just to say that the Pwn2Own Story from 2016 was complete bullshit. Of course, no official person came out and said that Firefox is too easy to hack, so let’s not help secure it better.

The actual reasoning was that Firefox had not made any major changes to its security architecture since the previous Pwn2Own, so it was unlikely that they would find many new vulnerabilities.
And Firefox had at that point not made major changes since the previous Pwn2Own, because they were still in the middle of the biggest browser modernization effort in the history of browsers.