Unsolicited sales offers in Firefox

Hello Murray,
We are extremely sorry to keep you informed that as mentioned on our webpage the TuneUp Utilities support ends on December 31, 2016. We kindly request you to upgrade your subscription to the AVG PC TuneUp. Please contact our sales support team via https://support.avg.com/support_sales_chat to assist you better in upgrading your subscription and further queries regarding the upgrade.
Thank you.

I have PC Tune Up 2014.  It's all I want or  need.  Recently I've started getting self loading pages from AVG telling me that 2014 is reaching end of life and offering a 50% savings on the latest product.  Talk about spam !!!  These pages load all by them selves after some inactivity in Firefox.  My one contact with AVG for support about stopping this from happening told me to just ignore them.  Right.  You ignore your browser loading a page all by itself to a sales offer from AVG.  This is the address of the page that is loading:

TuneUp Utilities | End of Life

Anyone know how to stop this crap?  AVG is really starting to piss me off.  BTW,  you go to the contact page for tech support, fill out the box describing the problem, hit continue, it askes what phone number you'll use to contact them, BAM.  Your typed info is gone.  What??  It isn't a real web based form to ask for help.

Hello Murray,
We are extremely sorry to keep you informed that as mentioned on our webpage the TuneUp Utilities support ends on December 31, 2016. We kindly request you to upgrade your subscription to the AVG PC TuneUp. Please contact our sales support team via https://support.avg.com/support_sales_chat to assist you better in upgrading your subscription and further queries regarding the upgrade.
Thank you.