Page JavaScript calling a Firefox extensions JavaScript

My Firefox开发者_C百科 extension has a button which when clicked, injects some JavaScript code into the current page. How can this injected JavaScript code in a web-page call a JavaScript function in my extension? It would be helpful if someone could point me to an example.

Thanks.

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It boils down to dispatching events from the document object and listening for them from your extension. You must create a listener for these events on a per-tab basis. You may also be able to catch them using jQuery embedded in your extension.

The simplest way to do this is outlined here:

https://developer.mozilla.org/en/Code_snippets/Interaction_between_privileged_and_non-privileged_pages

You can set up a JS library (on your page) and a matching library in your extension that allows you to do exactly this in a repeatable way.