I was reading the ToS. Here are some things that we've implicitly agreed to by using Goko services.
You agree that you won’t create an account or access the Service if you (i) are under the age of 13, (ii) are a convicted sex offender, (iii) if you have previously been denied by Goko use of or access to the Services or Websites, or (iv) you are located in a country embargoed by the United States or if you are on the U.S. Treasury Department's list of Specially Designated Nationals.
You agree that you will not use your account to engage in any illegal conduct. You are prohibited from posting on or transmitting through the Website or Services any partially or fully nude images of anyone, at any age, of any gender, including sexually suggestive images or words, unlawful, harmful, threatening, abusive, harassing, defamatory, vulgar, obscene, sexually explicit, profane, hateful, racially, ethnically or otherwise objectionable material of any kind that infringes the intellectual property rights or is otherwise injurious to third parties, including but not limited to any material that encourages conduct that would constitute a criminal offense, give rise to civil liability or otherwise violate any applicable local, state, national or international law.
You agree that you will not (i) interfere or attempt to interfere with the proper functioning of the Service or connect to or use the Service in any way not expressly permitted by these Terms of Use; (ii) Use any unauthorized third party software that accesses, intercepts, "mines", or otherwise collects information from or through the Service or Websites or that is in transit from or to the Service, including, without limitation, any software that reads areas of RAM or streams of network traffic used by the Service to store information about Goko game characters, game elements rules or game play
etc.
So apparently people under 13 shouldn't play Goko games. That seems odd. The last paragraph might even give Goko grounds to disallow their users from using the script extension at all. If not at all, then at least if it is being used to "transmit partially or fully nude images".