Firefox's Adblock Plus add-on has a supporting add-on called Element Hiding Helper that is helpful for situations such as these. You just press Ctrl+Shift+S and you can block pieces of websites as you see fit.

From jaimeastorga2000. You still have to deal with the tabs from the first page, but once you block everything it's effective immediately for all open windows and you're basically immunized against the site for good. Just make sure you have "When I open a link in a new tab, switch to it immediately" unchecked in Firefox's options before you start.