egNuKe asks: "Like some people here, I use Firefox and Adblock. I've blocked the ads that Yahoo puts in my inbox, however the next time I opened it, I've found other ads, and blocked them too. This happened for several times, until I figured out that Yahoo must have some script that checks if the ad is displayed and displays another one, if it hasn't. This is no big problem, I just needed to add several rules to Adblock to block the several ad sources they use. Here is the problem: when Adblock is running and effectively stopping Yahoo mail ads, Firefox would freeze (all open windows and tabs) for about 15 seconds. Then the page opens and there is no ads. The script must be on client side, since it's the browser that's freezing and not the network. Turning off Adblock solves the freezing problem. Is there a cure for this?"