Need javascript for copy& paste

f i right click in firefox browser i added a extra context menu by using the firefox extensions if i click that menu some functionality to be added so  needed a java script.

if i select (highlight)some text from a window which is opened in firefox browser and i rightclick in the browser window   context menu(which is added my me) will appear and i click the menu  the selected text must be copied and pasted in a new window.

Iam attaching a file which is used when we select some text and click a button the selected text is added to a text area. i need the same functionality but for context menu .
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BarsMonsterConnect With a Mentor Commented:
There is no control over "system" context menu, but you may emulate lightbox-based context menu and do on click on it's items.
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