When I open multiple tabs, the first and second tabs load the webpage, but the third or fourth tab and those there after never load the requested web pages; instead, they say connecting infinitely.

I am running Firefox 7.0.1. As long as I don't open more than 2 or 3 tabs, everything runs fine. However, I am in the habit of going to a news website, and opening all of the interesting articles by right-clicking on each link and selecting "Open in a new tab". After upgrading to Firefix 7.0.1 recently, anytime I try to open more than 3 tabs, the first two tabs load fine, but the third or fourth tab (not always consistent) and subsequent tabs just say "connecting..." but never do connect. Then any time I try to head to a new site or click a link, even in the first or second tab, it never actually connects.