According to Wikipedia, Censorship is :
the suppression of speech, public communication, or other information, on the basis that such material is considered objectionable, harmful, sensitive, or “inconvenient.” Censorship can be conducted by governments, private institutions and other controlling bodies
Some person or organization has reported PeerHash to Google as unwanted software that can cause harm to your computer and as such browsers such as Firefox attempt to stop you from visiting PeerHash.com.
PeerHash.com has always been explicit about its function: It is a software GUI that helps you quickly download XMR mining software and start mining in minutes. Warnings have always been listed on each release advising never to run any GUI or mining software on computers that are not dedicated for cryptocurrency mining.
It’s unfortunate this has occurred, however we will continue to develop PeerHash for those people that want to trying crypto mining at home. As always, mine at your own risk. Here is a link to the Mining Best Practice page: