JavaScript wait for an element to load

Question

I'm writing an automation extension for Mozilla and I have an issue. How do you sleep script after executing click event, so that new elements can load. If I try putting setTimeout in recursion, ie if element is null, go back to the start of function after x time, this causes browser to hang. I'm testing in a scratchpad so I'm not sure how to import modules.

Answer 1

If it opens a new window when you click on it you can use window.onload = someFunction()