Yes, please sign the petition.
Hopefully, it'll help in convincing them not to pass the bill :/
I'm not sure for other countries how the censorship would work, hopefully if the bill is passed, it doesn't affect any other countries.
Although I'm pretty sure it will, since the bill states that websites can be sued, resulting in them not being able to host advertisements (among a long list of other things), which will then result in the website not being able to continue running because of insufficient funds.
Most of the websites we know and love are American, so if they're affected by the bill, there's a high chance they'll just be removed from the Internet altogether.