Hi eoin45, The only info that I could find at the Malwarebytes Threat Center is for frtyn. com. See here: frtyn .com

When Malwarebytes quarantines it, you should be able to determine which folder it is in and then eliminate the root cause of it - maybe an extension?

You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

tfrtyn.com, t.frtyn.com, or frtyn.com call is executed when firefox.exe opened. i think it is due to an add-on.

add-on creator should be banned.

@ allan.feldberg , Determine which extension it's coming from. When you Remove the extension, you will have the opportunity to Report the extension. It may then be retired to the Blocked Add-ons list and the Author may ultimately be retired with it.

You can check the connection settings.

• Options/Preferences -> General -> Network: Connection -> Settings

If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.

See "Firefox connection settings":

• https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can