Yes the large ad in the lower left corner is very intrusive and annoying - after clicking the "x" in the ad's upper right corner it
would disappear but would pop back about every 20-30 sec.
I was super frustrated with it yesterday as I couldn't read postings since it popped up frequently and was blocking the threads.
I clcked on the little icon that sits to the left of the "x" in the right hand top of the ad and it took me to a page where I clicked unsunscribe -The ad is not appearing today. I was apprehensive to do this because I didn't want to have anything imbed in my system so I next cleared all browsing data and cookies and did a system check. Hope it worked with nothing left behind in my system