Hopefully 4 hours well spent - I hope that is all of the bad stuff found and removed.
It will not hurt to reset Firefox to 'squeaky clean' either, just to be on the safe side - see my link above.
If you really want to keep using Firefox, try the link below - it should clear any Firefox-specific issues -
https://malwaretips.com/blogs/reset-firefox-settings/
"In the wording of massages random words are in blue and as a link" - does this only happen with the NSC site, or with others as well?
If only with NSC, does the same happen if you are logged in or not?
Which browser do you use?
Which anti-malware tools have you tried using?
Have you tried...