Hi jmmd I don't speak Spanish so I translated your question from Spanish to English using Google Translate. Here is my reply in English: Sorry to hear about this. This unfortunately doesn't appear to be a Firefox problem. We have the following documentation which I suggest you read and try out (if you haven't tried these solutions already - I note from your question that you have already tried some anti-virus and anti-malware solutions). * https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware * https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems Here is my reply in Spanish (again I don't speak Spanish so this was translated by Google Translate): Siento oír hablar de esto. Esto por desgracia no parece ser un problema de Firefox. Tenemos la siguiente documentación que le sugiero que lea y pruebe (si no ha probado estas soluciones ya, observo en su pregunta que ya ha probado algunas soluciones antivirus y anti-malware). * https://support.mozilla.org/es/kb/troubleshoot-firefox-issues-caused-malware * https://support.mozilla.org/es/kb/troubleshoot-and-diagnose-firefox-problems Hope that helps! ...Roland