Someone using a Mac had problems too.
It’s very mysterious.
Let me throw out a theory: It looks like these websites have been hacked and throw out malware. Some browsers are better than others at blocking the malware itself and showing the page, and others will simply block the page. It depends on adblockers that are installed. That could vary from browser to browser with different options enabled for different computers. If a FR page has an image linked that comes from a known bad domain name, it will also block that page from showing.
Maybe the Chinese are now focused on Q and using the backdoor to hack websites.