Browsers are not working

1 - Restart in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal.

2 - Does the issue present in this mode ?

3 - Sometimes a Safe Boot followed by a Normal Boot will just put things right.

4 - If not - there could be something in the main User Account playing up. To further isolate this - Set up users, guests, and groups on Mac. Then log out of the Main User account and log into the dummy account and test again if the issue persists.

5 - If the issue is present in the dummy account - then, this appears to be a System Wide issue on the computer.

Understand, we are all working Remotely from all around the world. 

Therefore, we do not have the On-Hands experience the User ( you ) has with this computer.

The next best thing for us to having an actual On-Hand experience on this computer is to follow the steps below

Download the Application Etrecheck directly from a well Respected ASC Contributor. And Safe to use.

The application is free or paid from added features. 

Run the application with Full Disc Access ( Security & Privacy - Full Disc Access ).

It will take a Snap Shot -  both the hardware and software.

 The Report will Not Reveal Any Personal Information. 

Post back the Full Report - copy and paste - using the Additional Text Icon ( 3rd Icon to last )

We can have a look at the report for possible issues and may have possible suggestions to resolve the issues.

You need to follow the advice in Etrecheck and remove the malware.

If Etrecheck is able to remove it, that’s the easiest.

If not, you can do it manually.

I Finder press Command-Shift-G and paste

~/Library/LaunchAgents/com.apple.dock.plist

drag the file to the trash

Repeat with

~/Library/Caches/GitServices/AppleWebKit

then restart your mac. Rerun Etrecheck to confirm that the malware is no longer there.

NOTE: you installed a bunch of things today, and most likely one of them was laced with the malware. Revise your steps and make sure to only download from trusted sites.

Follow the very good advise from Contributor @Luis S above.

Though, posting the Full Etrecheck Report will probably illustrate possibly additional issues that need to be addressed.

That is a User ( your ) choice.

The OP had posted a link to a pdf of the report, but as usually happens, it was removed.

To the OP: when posting the Etrecheck report, do it this way so it is not removed: Click Share Report->Copy Report, then in a post here click the "additional text" button and paste the report into the text box.

Heyo,

That’s a very suspicious behavior. My suggestion is to make an Apple Store Support appointment.

Thank you my friend 😀. obrigado meu amigo 😀

You are welcome and thank you too.

Do come back to the Apple Support Communities ( ASC )  in the future, if / or when additional questions may arise