The link leads to the following text:
The internet we know and love is at risk. Help save it.
Right now, the U.S. Congress is considering legislation that could profoundly affect the future of the internet. It's called the Stop Online Piracy Act.
The fact is that this legislation as written won't stop piracy. But it would pose a serious threat to social media and user generated content sites (like YouTube) across the internet. It could also undermine some of the core technical systems underlying the internet, creating new cybersecurity risks.
As a non-profit committed to keeping the web open and accessible to all, Mozilla wants to ensure that this legislation does not jeopardize the foundational structure of the Internet.
I hope American readers will take the time to investigate further.