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This code now needs to get merged into the browser so it can access elements within the application. We do this by providing a [ XUL Overlay] file. A XUL Overlay is a .xul file that specifies XUL fragments to insert at specific merge points within a "master" document. Often this is used to add new UI to an application (e.g., a new menu item), but in our case we'll use it to merge our addtabbeside.js script into the browser.
We need to create '''addtabbdeside/chrome/content/overlay.xul'''(remove extra spaces if you copy and paste):

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