I have created a plugin with a sidebar. I would like to be able to change the URL of the current tab in the sidebar's window or open a new tab, given that I click a button in the sidebar (or an event is triggered in the sidebar). I am currently using the following Javascript code to go to a new URL: content.location = newURL; However, I have other buttons in the sidebar that open new (small) windows. If I first click one of these buttons to open a new window, then the above code fails; it changes the URL of the tab in THAT NEW WINDOW, not in the window of the sidebar. How do I change this? This also seems to be complicated by the fact that the sidebar document does not have a parent. Any tips are appreciated!