Hello Martha192, As you've already suspected, you've picked up some malware that you will of course want to get rid of. 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://www.2-spyware.com/remove-akamaihd.html#h-mac-os-x Especially for Mac : https://www.malwarebytes.com/mac/