: protocol, and it won't assume you want hypertext transfer protocol colon forward-slash forward-slash
prepended (grr... stupid url regex). Open the bookmarklet and it'll execute on the current tab.
And you'd realistically want to use something like:
Given that Android's support for Greasemonkey and plugins is rather limited, this is a great boon. Personally, I added one for my password manager, which makes web browsing so much more pleasant and secure.