Maybe a different issue (and maybe not .... ), but of the utmost importance : Your system details show that there are a lot of extensions installed that are browser hijackers, malware that you will need to get rid of : FromDocToPDF 8.837.13.46585 ([email protected]) Maps 100.3 (web@Maps) MyTransitGuide 8.837.13.47254 ([email protected]) Search Extension by Ask 50.100.12.64537 ([email protected]) Search-Encrypt 2.2.16 (@search-encrypt) Template 100.7 (web@Template) Go to the Firefox menu (≡) => Add-ons => Extensions ( Mac : Command + Shift + A) And remove the extensions. As the extensions may have put some more malware on your system, let's run some malware scans : 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. Especially for Mac : https://www.malwarebytes.com/mac/ And : https://malwaretips.com/blogs/remove-mac-os-x-virus/