Try as you may, there is no perfect software, neither in terms of programs nor in terms of operating systems. All the software in the world contains bugs and some of them are vulnerabilities that can be used to hack it. That is what has been demonstrated again in the Tianfu Cup in China, where they have hacked three of the most used web browsers: Chrome, Edge and Safari, the last two being the proposals installed by default in Windows and macOS respectively.
La China Tianfu Cup (Via ZDnet) is an alternative to Pwn2Own. In both cases, both software and devices are tested for "Zero-Day" bugs, that is, uncorrected and unknown vulnerabilities that can be exploited by a malicious user. The most "worrying" thing, in quotes, is that Chrome, an older version of Edge (the «Chromium» still in beta) and Safari were hacked on the first day of the contest.
Chrome, Safari, and Edge fell on the first day
Other software and gadgets that fell in the contest were Adobe Reader, Microsoft Office 365, the D-Link DIR-878 router and Qemu-KVM running on Ubuntu, this on the first day. On the second day, Adobe Reader and D-Link routers crashed again, becoming more of a concern, along with VMware Workstation operating system emulation software.
The contest is not too famous but, as Pwn2Own, it serves for three things: finding bugs that they can fix, the winners get money and, which could be included in the second point, that the security researchers make themselves known. That he is not famous also means that all the details of some bugs found that they do deliver to the creators of the software are not known.
Good for users of Firefox is that Mozilla's browser has not been mentioned, so it is assumed that they failed to hack it in this contest. All the more reason to ditch Chrome and use the fire fox proposal.