How to delete Grammarly extension from Safari? When I try to delete Grammarly extension from Safari, it says:

The “Grammarly for Safari” extension is part of the “Grammarly for Safari” application.
To uninstall “Grammarly for Safari”, you must remove the “Grammarly for Safari” application.

And when I try to delete it from the Finder, it says:

The item “Grammarly for Safari” can’t be moved to the Trash because some of its extensions are in use.

How do I break this deadlock?
MacOS: High Seirra 10.13.6; Safari: 12.0.3; Grammarly: 9.4
After some trying, I figured it out.

Close all the apps that might be using Grammarly and delete it from finder. 

No need to remove the extension from Safari after that.