Bro Use Chrome and use adblockplus,and follow these instructions, that how i've done it in Chrome,
i use to have Firefox but at some time i was presented with that same black screen in Firefox and i never could figure out how to block element in firstrowsports, and came across this easy way, see link bellow, for Chrome so much so that i changed all my PC's browsers to Chrome even i signed in, in Chrome, and use SYNC option so my favorite bookmarks are all there on my pc's all the time,if need to reinstall OPS,Browser and so on,
Chrome is the best.
Here the way i did it in Chrome,after installing Chrome i installed adblock plus, then i went to firstrowsports opened the page, with the firstrow page opened then i clicked on the red Adblock applet then clicked on block Element and again clicked on red adblock applet and a colored screen opens and
this will show in the corner, ifirstrowus.eu##DIV[id="adblockplus"] just leave ##adblockplus and click add and that's it no more dmn adds in that site
http://www.reddit.com/r/cordcutters...ul_tip_for_firstrowsports_new_adblock_prompt/