When I am working on the internet, I often open a new tab, click the bookmark for where I want that to go to. Then go back to the prior tab I was using, while the new tab loads. EXCEPT, now I am finding, the non-active tab is NOT loading the page I instructed it to. So when I go back to that TAB, expecting to see the page I wanted, loaded, instead I get the little circle and still have to wait for it to load. Why is Firefox doing this?