Mac - No such Chrome process

Installed the requirements and tried running the app but got an error immediately.
```
python3 cookie_crimes.py

Traceback (most recent call last):
  File "cookie_crimes.py", line 147, in <module>
    cleanup(forbidden_process)
  File "cookie_crimes.py", line 130, in cleanup
    os.kill(chrome_process.pid + 1, signal.SIGKILL)
ProcessLookupError: [Errno 3] No such process
```