Q: how can i make my safari browser bug free?

keep Safari (and your OS X) updated from Apple and practice safe browsing habits.

you can reset Safari at any time by launching it while holding down the SHIFT key

There are no viruses that can attack Mac.OS X. So, anti-virus programs are selling a cure for a disease that doesn't exist. And they are renowned for borking Mac systems.

A Mac can pick up malware but not if you just use common sense. You really have to actively invite some malware in for it to happen.

Do not get fooled by products that claim to clean, virus check or optomize. MalwareBytes.is a program that does not run constantly in the background as some "so-called" anti-virus apps do. Malwarebytes is used by Apple Support Reps to scan for Malware and is about the most proven anti-malware software for Mac.

Safari is already very secure by default. Willfully modifying it with third party extensions and plug-ins can make it less secure, so all you have to do is to avoid doing that. No such modifications are required for normal operation. That includes non-Apple products claiming to "secure" or "protect" your Mac. They will accomplish the opposite.

Read Safari: About Internet plug-in management - Apple Support. If you should ever find that it does not work as you expect it should, read If Safari is slow, stops responding, quits unexpectedly, or has other issues - Apple Support.

There are many scams that seek to exploit computer users, and they are not limited to the Mac. Here are a few User Tips on that subject:

Phony "tech support" / "ransomware" popups and web pages

Beware bogus Adobe Flash "installers"

How to install adware

Effective defenses against malware and other threats