Hello tomwv_2,

As you probably will have guessed : you've got malware, that you will of course want to get rid of.

Would you do this please :

Go to the Firefox menu (≡) => Preferences => Add-ons => Extensions and remove anything that looks unfamiliar or suspicious.

Next step is to run malwarescans - 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. They all work differently - what one program doesn't pick up, the other might.

Also see : https://topvirusclearner.com/2018/12/get-rid-of-barisderin-com-virus/

And : https://uninstallandremoveit.com/help-remove-barisderin-com-pop-completely-updated-mar-2018/

Especially for Mac : https://www.malwarebytes.com/mac/

Baris Derin is the creator of quite a few extensions and he has the habit of going to his website each time one one of his extensions is updated.

• https://addons.mozilla.org/firefox/user/4010195/
• Homepage: http://barisderin.com/

So probably nothing to worry if you you use one of his extensions.

You can check the homepage setting and possibly check for issues with the extensions.

• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems