Ads Popping Up when Reading Threads

The worst site for me is one I'm paying for........Slime Timer Worner's own email. Pisses me off. It was so slow it was a crime. I finally tried turning off the ad blocker just for that site, and it kinda / sorta speeded up response on that page, but then the computer (Firefox) became a memory hog. Everytime I check that email, I have to open a page, log in, and then close the window, otherwise it sits there and "hogs."