malwarebytes worked, but unsure if things okay, keep seeing this website pop up

[atldawgfan]

So I use an old desktop for web surfing and yahoo email. No games, tv streaming, or downloading any music. I could not get on the web for about a month then I found this great tool from Malwarebytes b/c the Norton that comes from my Comcast account was not resolving the issue. Ran the scan several times and found "trojan" and quarantined several items. I was back on the internet. But not every day, but occasionally a new tab or new window from Firefox appears and says "critical Firefox update"  with download now green box. and also a pop up file that wants to save a file for "update" by clicking it. I do not and X out of it. I even got Norton to say not safe. But I still get that, the scans now show all clear, but wondering if I can block that site or is the computer still infected? thank you for any suggestions.. 

I tried to copy the url and a snip of the last one.

https://ohneemypanchang.org/119410866614/acc298d290d1fc2f4522f1ea2cd5f323/aeb98e81a7a198008debf79c5af60e98.html

[Firefox]

Hello and Welcome to Malwarebytes

Sounds like you have some left overs from an infection or a browser hijack.

We are not permitted to work on possible malware-related issues here in this section of the forum.
Such work is conducted in a special forum area reserved for that purpose, or at the help desk.

So, for expert assistance, I suggest that you please follow the advice in this pinned topic: Available Assistance For Possibly Infected Computers.

It explains the options for free, expert help -->>AND<<-- the suggested, preliminary steps to expedite the process.
A malware analyst will assist you with looking into your issue.

Thank you