Final Cut Pro Crashing after installing some non compatible effects

Follow *carefully* the instructions in https://chromeisbad.com.

In the system and user Library folders you'll find folders called LaunchAgents. Delete all anything that starts with and com.google.keystone

Again, the link above tells all in details.

Run EtreCheck again until there are no occurrence of the name keystone in the report... Good luck!

You still have 2 keystone launch agent files. You need to manually delete *all* of them, after chrome was removed. It is a good idea to reinstall fcp.

Make sure you trash your preferences every time FCP crashes.

Where exactly is it located? Did you do a Finder search including System folder?