Uninstall the software that is the cause of the problem? FF can't stop something when the user permitted it's install and usage. Otherwise you need to contact the site about the software issue.

I will move the question to Firefox for Enterprise as that would be a better place to ask about GPO.

WestEnd said

Uninstall the software that is the cause of the problem? FF can't stop something when the user permitted it's install and usage. Otherwise you need to contact the site about the software issue.

sorry about my english. i need in my local intranet workstations disable OCSP on FF to avoid alert about certificates generated on my certification authority on IE this no happens as we know, i know how to disable locally one by one workstation, but is difficult because are many computers. so the best will be disable via GPO sorry again my english

If you can't do this via GPO then you would have to use an autoconfig file.

• https://support.mozilla.org/en-US/kb/customizing-firefox-using-group-policy
• https://support.mozilla.org/en-US/kb/customizing-firefox-using-policiesjson
• https://support.mozilla.org/en-US/kb/customizing-firefox-using-autoconfig