Hello calleM25,
Thanks for using the Apple Support Communities. We understand that you're looking for options to assist in removing Sina Weibo from your Mac. We'll be happy to help.
You mentioned that you tried to correct this issue using safe mode. Did you try again after booting out of safe mode? If not, boot up as normal and test again.
If the issue with Chrome and Safari quitting unexpectedly continues, the steps in the following links can help:
If an app freezes or quits unexpectedly on Mac
If Safari is slow, stops responding, quits unexpectedly, or has other issues
For concerns with a virus, one of the best things you can do is make sure macOS is up to date. You can also run Malwarebytes as well. These links can help:
How to update the software on your Mac
Malwarebytes Cybersecurity for Home and Business | Malwarebytes
You might also consider accessing Disk Utility and running First Aid to see if that helps.
How to repair a Mac disk with Disk Utility
Best regards.