In a previous post I mentioned how Greasemonkey could make things a bit akward for site reliant on advertising and today I find that you can add a small script that will disable Greasemonkey for your site. From the ever so talented Dean Edwards comes a nifty little script. Insert that little script in your page and GreaseMonkey is no more. The downside is of course, advertisers can do this too… Downside? Yeah maybe for some but I like the idea of site owners being able to control the way their code displays... UPDATE: from Aaron Boodman (Greasemonkey project lead) -- This way to prevent greasemonkey is caused by a bug in greasemonkey which will be fixed soon. -- Site owners would best avoid wasting the effort. There is no non-legal way to control the way your content is rendered. Thanks for the update Aaron, but what do you mean by "non-legal way"? MORE UPDATE: When you create an HTML webpage, you cede any claim on it's presentation *technically*. I can't speak for legally, which is why I said 'no non-legal way'. More in the comments if you're interested.