AVG v Firefox ESR win xp

Hi  AVG internet Security on the most recent update has decided to block Firefox ESR under XP.
Can someone please tell me how to get it to work properly please?
Or get AVG to FIX it!
Please note, I have to run XP for various work utilities, and need to access the internet at the same time. XP, SP3, plus all patches. AVG Internet Security, which was fine until it updated to the new looks like IS Unlimited version. Firefox 52 ESR
General use I use Win7 which doesnt seem to suffer the same problem.

Thank you
Kevan

Kevan,
I am sorry to hear about the inconvenience caused. Upon checking your account details, I see that you have both AVG Internet Security - Unlimited (1 year subscription) and two AVG Internet Security (1 computer) programs active which are identical products. I would suggest you to contact our technical support team ( http://avgclick.me/AVGtechnical ) for further validation of your account details and resolve your issue.