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Tens, if not hundreds of millions of Firefox users will see this screen when they first boot up the popular web browser. The entire page is blacked out and the Firefox logo is redacted.
Mozilla, the open-source company behind the Firefox web browser, has been one of the staunchest opponents to SOPA in recent months, and is using its vast user base to spread the message about Internet censorship.
You can read Mozilla's comments here.
Reddit has been one of the spearheads of the anti-SOPA and PIPA protesting movement. Through activism and lobbying pressure, the 35 million odd users on the site from all over the world have changed the political landscape, organised online boycotts and helped spread the word of the anti-piracy laws.
The user-curated news-sharing site will go dark from 8am--8pm in protest of the bills currently in Congress.
You can read Reddit's comments here.
Tucows prides itself on providing simple, useful services to ordinary people to empower them into using the web effectively.
Tucows followed suit shortly after the Cheezburger chief executive Ben Huh announced it on Twitter. They said in a statement: "With SOPA, or ProtectIP, that leadership will effectively end and Syria, China, Iran and others will not only use the US as a role model, they will also use these actions as further evidence of US control of the Internet".
You can read Tucows' comments here.