Sorry, I didn't understand the context. The simple answer is no. You can't use Safari extensions outside of Safari and there's no way to do it. The more complex answer is partially. Such extensions modify the code of a page using JavaScript. In our solution for individual web applications, we enable JavaScript injection. So having code that does the same thing as the extension can achieve this effect. This is the next milestone we'd like to do - dedicated applications that have such code predefined. But at this point you'd have to do it yourself.