Yeah, you can't unilaterally change the terms of service for a site you're using. If you use the site, you're bound by their existing TOS. If you want to have those terms amended, you'll need to discontinue use of the site until / unless they accept your changes. And good luck with that from your bookmarklet.

None of the above. It's a scheme to pass your IP address to CDNs such as akamai so that they can select an edge server that's closer to you. Absent this, CDNs select an edge server closest to your DNS provider — that's fine if you're using your ISP's DNS, but in the case of an OpenDNS or Google Public DNS, that's likely a poor choice.