When I open Firefox, the page won't load - I get an error message

404 - That's an error. I cannot open my Firefox and keep getting this error message. Am a bit of a dinosaur and unable to find answer on support site.
thanks

Some problems occurs 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, then add it back. For detailed instructions, see
'''[https://support.mozilla.org/en-US/kb/configure-firewalls-so-firefox-can-access-internet Configure firewalls so that Firefox can access the Internet.]''' {web link}

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When I open Firefox, the page won't load - I get an error message

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