An excellent free ad-blocking extension that I’ve been using for a long time; it effectively blocks pre-roll ads on major Chinese streaming sites (Youku, iQIYI, Tencent Video) without triggering those annoying black-screen countdowns. However, it seems Mozilla has bowed to pressure from domestic advertisers and blocked access to the pages for ad-blocking extensions like this one. This raises the barrier to entry for Firefox and makes the browser less user-friendly for those of us in China.