An intrusion attempt by linuxoutsideextremeslip.xyz was blocked

An intrusion attempt by linuxoutsideextremeslip.xyz was blocked and I received an Alert from Norton which says:

Severity    Activity                                                                                                Date & Time                 Status   Recommended Action
● High    An intrusion attempt by linuxoutsideextremeslip.xyz was blocked       3/3/2017 1:14:00 PM    Blocked    No Action Required
 

Advanced Details                                    
    IPS Alert Name    Web Attack: Fake Scan Webpage 29        
    Default Action       No Action Required                        
    Action Taken         No Action Required
    Attacking Computer    linuxoutsideextremeslip.xyz (160.153.162.194, 80)    
    Attacker URL        linuxoutsideextremeslip.xyz                
    Destination Address    HP-PC (192.168.0.4, 58045)                
    Source Address    linuxoutsideextremeslip.xyz (160.153.162.194)        
    Traffic Description    TCP, www-http

Here are a few of my thoughts/questions to the community (perhaps someone knowledgeable might help me):

1) I did a Google search and found that this is not the first time an intrusion like this has happened. But google were able to find only a handful of cases/reports with similar situation. What can I/we do to stop this nonsense from happening again?

2) Apparently, the attacker has a known web address as shown above. Is it possible someone or somehow we can identify him/her to the law enforcement?

3) I just wonder what is the destination address of "192.168.0.4, 58045" mean? Is this the address of my computer (looking from my LAN) or is it something more specific (such as one of my hard drive)?

4) Am I safe from similar intrusions from some other attackers? I other words, can I trust Norton to always being able to catch something like this?

5) Not long ago, I mistakenly downloaded and installed a "malware" entitled Firefox-patch.js which seemed to me like a legitimate patch from Mozilla Firefox. It has since caused print looping errors and prevented me from using print function on all e-mails in my gmail. I am wondering if today's intrusion has something to do with that virus? (For example, during the installation of that Firefox-patch.js, it brought up a command prompt window and showed a command: "ping -n 4 localhost". The number "4" in this command seems to imply/coincide with the intrusion destination address of 192.168.0.4.)

Thanks for reading and any comments/help is appreciated.

Tong