Do you feel your company is well protected from hackers?

Hi Indie Hackers!

Hackers are constantly finding new ways to exploit vulnerability. I am wondering how everyone is protecting themselves and their companies from hackers. Specifically, in the following areas:

1, How do you protect against malicious softwares?
2, How about browser extensions?
3, How about the dependencies that are bundled into your production system?

Does anyone have a good solution for the 3 areas above?