hi, as this is sometimes a symptom of malware on a system, please try to run a scan with various security tools other than your main solution like the free version of malwarebytes, adwcleaner & eset online one-time scanner.

After the above,

Some problems occur when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted. Now how to fix the problem: To allow Firefox to connect to the Internet again;

• Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
• Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see

Configure firewalls so that Firefox can access the Internet. {web link}